经过三周的不断尝试，终于成功下载Chromium（Android） 66.0.3358.0

ljh@ljh-ubuntu:~/chromium/src$ gclient sync --with_branch_heads --jobs 16
Syncing projects:   4% ( 4/99) src/chrome/browser/resources/media_router/extensiSyncing projects:   5% ( 5/99) src/third_party/apache-portable-runtime/src      WARNING: subprocess '"git" "-c" "core.deltaBaseCacheLimit=2g" "fetch" "origin"' in /home/ljh/chromium/src/third_party/boringssl/src failed; will retry after a short nap...
WARNING: subprocess '"git" "-c" "core.deltaBaseCacheLimit=2g" "fetch" "origin"' in /home/ljh/chromium/src/third_party/icu failed; will retry after a short nap...
WARNING: subprocess '"git" "-c" "core.deltaBaseCacheLimit=2g" "fetch" "origin"' in /home/ljh/chromium/src/third_party/libaom/source/libaom failed; will retry after a short nap...
WARNING: subprocess '"git" "-c" "core.deltaBaseCacheLimit=2g" "fetch" "origin"' in /home/ljh/chromium/src/third_party/pdfium failed; will retry after a short nap...
Syncing projects:  89% (98/109) src/third_party/angle/third_party/spirv-tools/srSyncing projects:  90% (99/109) src/third_party/liblouis/src                    Syncing projects:  93% (102/109) src/third_party/angle/third_party/vulkan-validaSyncing projects:  94% (103/109) src/third_party/deqp/src                       Syncing projects: 100% (109/109), done.                                 
Running hooks:  35% (21/60) gn_linux64       
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --bucket chromium-gn -s src/buildtools/linux64/gn.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  40% (24/60) clang_format_linux
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --bucket chromium-clang-format -s src/buildtools/linux64/clang-format.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  46% (28/60) content_shell_fonts
________ running 'download_from_google_storage --no_resume --extract --no_auth --bucket chromium-fonts -s src/third_party/content_shell_fonts/content_shell_test_fonts.tar.gz.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  53% (32/60) luci-go_linux      
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --bucket chromium-luci -d src/tools/luci-go/linux64' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  58% (35/60) msan_chained_origins
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --bucket chromium-instrumented-libraries -s src/third_party/instrumented_libraries/binaries/msan-chained-origins-trusty.tgz.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  60% (36/60) msan_no_origins     
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --bucket chromium-instrumented-libraries -s src/third_party/instrumented_libraries/binaries/msan-no-origins-trusty.tgz.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  61% (37/60) wasm_fuzzer    
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth -u --bucket v8-wasm-fuzzer -s src/v8/test/fuzzer/wasm_corpus.tar.gz.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  63% (38/60) node_linux64
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --extract --no_auth --bucket chromium-nodejs/8.9.1 -s src/third_party/node/linux/node-linux-x64.tar.gz.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  68% (41/60) webui_node_modules
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --extract --no_auth --bucket chromium-nodejs -s src/third_party/node/node_modules.tar.gz.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  75% (45/60) tools_traffic_annotation_linux        
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --num_threads=4 --bucket chromium-tools-traffic_annotation -d src/tools/traffic_annotation/bin/linux64' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  78% (47/60) zucchini_testdata               
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --num_threads=4 --bucket chromium-binary-patching -d src/chrome/installer/zucchini/testdata' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  85% (51/60) checkstyle                
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --bucket chromium-android-tools/checkstyle -s src/third_party/checkstyle/checkstyle-8.0-all.jar.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  86% (52/60) gvr_static_shim_android_arm
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --bucket chromium-gvr-static-shim -s src/third_party/gvr-android-sdk/libgvr_shim_static_arm.a.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  88% (53/60) gvr_static_shim_android_arm64
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --bucket chromium-gvr-static-shim -s src/third_party/gvr-android-sdk/libgvr_shim_static_arm64.a.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  91% (55/60) vr_controller_test_api       
________ running '/usr/bin/python src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --bucket chromium-gvr-static-shim/controller_test_api -s src/third_party/gvr-android-sdk/test-libraries/controller_test_api.aar.sha1' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks:  96% (58/60) doclava               
________ running '/usr/bin/python src/build/android/download_doclava.py' in '/home/ljh/chromium'
NOTICE: You have PROXY values set in your environment, but gsutil in depot_tools does not (yet) obey them.
Also, --no_auth prevents the normal BOTO_CONFIG environment variable from being used.
To use a proxy in this situation, please supply those settings in a .boto file pointed to by the NO_AUTH_BOTO_CONFIG environment var.
Running hooks: 100% (60/60), done.