Build URL:
==========
https://uberchromegw.corp.google.com/i/official.desktop/builders/mac64/builds/1494
https://uberchromegw.corp.google.com/i/official.desktop/builders/precise64/builds/1496

Log URL:
========
https://uberchromegw.corp.google.com/i/official.desktop/builders/mac64/builds/1494/steps/compile/logs/stdio
https://uberchromegw.corp.google.com/i/official.desktop/builders/precise64/builds/1496/steps/compile/logs/stdio

Error from the Log:
===================
FAILED: obj/content/browser/browser/touch_event_queue.o 
../../third_party/llvm-build/Release+Asserts/bin/clang++ -MMD -MF obj/content/browser/browser/touch_event_queue.o.d -DENABLE_SCREEN_CAPTURE=1 -DV8_DEPRECATION_WARNINGS -DNO_TCMALLOC -DUSE_EXTERNAL_POPUP_MENU=1 -DUSE_PROPRIETARY_CODECS -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DOFFICIAL_BUILD -DGOOGLE_CHROME_BUILD -DENABLE_MEDIA_ROUTER=1 -DCR_CLANG_REVISION=289944-2 -DCR_XCODE_VERSION=0511 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D_FORTIFY_SOURCE=2 -D__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORE=0 -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DCONTENT_IMPLEMENTATION -DV8_USE_EXTERNAL_STARTUP_DATA -DLEVELDB_PLATFORM_CHROMIUM=1 -DSK_IGNORE_DW_GRAY_FIX -DSK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS -DSK_SUPPORT_GPU=1 -DSK_BUILD_FOR_MAC -DU_USING_ICU_NAMESPACE=0 -DU_ENABLE_DYLOAD=0 -DU_STATIC_IMPLEMENTATION -DICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE -DGOOGLE_PROTOBUF_NO_RTTI -DGOOGLE_PROTOBUF_NO_STATIC_INITIALIZER -DHAVE_PTHREAD -DMESA_EGL_NO_X11_HEADERS -DFEATURE_ENABLE_SSL -DFEATURE_ENABLE_VOICEMAIL -DEXPAT_RELATIVE_PATH -DGTEST_RELATIVE_PATH -DNO_MAIN_THREAD_WRAPPING -DNO_SOUND_SYSTEM -DWEBRTC_CHROMIUM_BUILD -DWEBRTC_POSIX -DWEBRTC_MAC -DXML_STATIC -DSSL_USE_OPENSSL -DHAVE_OPENSSL_SSL_H -DFEATURE_ENABLE_SSL -DNO_MAIN_THREAD_WRAPPING -DFLAC__NO_DLL -I../.. -Igen -I../../third_party/khronos -I../../gpu -I../../third_party/leveldatabase -I../../third_party/leveldatabase/src -I../../third_party/leveldatabase/src/include -I../../skia/config -I../../skia/ext -I../../third_party/skia/include/c -I../../third_party/skia/include/config -I../../third_party/skia/include/core -I../../third_party/skia/include/effects -I../../third_party/skia/include/images -I../../third_party/skia/include/lazy -I../../third_party/skia/include/pathops -I../../third_party/skia/include/pdf -I../../third_party/skia/include/pipe -I../../third_party/skia/include/ports -I../../third_party/skia/include/utils -I../../third_party/skia/include/gpu -I../../third_party/skia/src/gpu -I../../third_party/skia/src/sksl -I../../third_party/ced/src -I../../third_party/icu/source/common -I../../third_party/icu/source/i18n -I../../third_party/protobuf/src -Igen/protoc_out -I../../third_party/protobuf/src -Igen/blink -I../../third_party/libwebm/source -I../../third_party/boringssl/src/include -Igen -I../../third_party/WebKit -Igen/third_party/WebKit -I../../v8/include -Igen/v8/include -I../../v8/include -Igen/v8/include -I../../third_party/mesa/src/include -I../../third_party/angle/src/common/third_party/numerics -Igen/angle -I../../third_party/libyuv/include -I../../third_party/re2/src -I../../third_party/zlib -Igen/ui/resources -Igen/ui/resources -Igen/content/browser/tracing -I../../third_party/webrtc_overrides -I../../testing/gtest/include -I../../third_party -I../../third_party/webrtc_overrides -I../../third_party -I../../third_party/expat/files/lib -fno-strict-aliasing -fstack-protector -fcolor-diagnostics -arch x86_64 -Wall -Werror -Wextra -Wpartial-availability -Wno-missing-field-initializers -Wno-unused-parameter -Wno-c++11-narrowing -Wno-covered-switch-default -Wno-deprecated-register -Wno-unneeded-internal-declaration -Wno-inconsistent-missing-override -Wno-shift-negative-value -Wno-undefined-var-template -Wno-nonportable-include-path -Wno-address-of-packed-member -O2 -gdwarf-2 -fno-standalone-debug -isysroot /Applications/Xcode5.1.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -mmacosx-version-min=10.9 -fvisibility=hidden -Xclang -load -Xclang ../../third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.dylib -Xclang -add-plugin -Xclang find-bad-constructs -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -Wexit-time-destructors -fno-threadsafe-statics -fvisibility-inlines-hidden -std=c++11 -stdlib=libc++ -fno-rtti -fno-exceptions -c ../../content/browser/renderer_host/input/touch_event_queue.cc -o obj/content/browser/browser/touch_event_queue.o
../../content/browser/renderer_host/input/touch_event_queue.cc:33:14: error: unused variable 'kMaxConceivablePlatformSlopRegionLengthDipsSquared' [-Werror,-Wunused-const-variable]
const double kMaxConceivablePlatformSlopRegionLengthDipsSquared = 60. * 60.;

Change Log: https://chromium.googlesource.com/chromium/src/+log/57.0.2987.41..57.0.2987.42?pretty=fuller&n=10000

Suspecting the below change could be a possible culprit.

https://chromium.googlesource.com/chromium/src/+/3a7825120516721b47e220d4075945834e78401f

@ lanwei: Assigning to you, request you to please take a look into it. Please help us to find an owner if not with respect to your change.

Adding Release block label, please undo if not the case.

Thanks.!