https://uberchromegw.corp.google.com/i/chromeos/builders/arm-generic-chromium-pfq/builds/2228

compile failure is this: chromeos-chrome-54.0.2789.0_rc-r1: armv7a-cros-linux-gnueabi-g++ -B/usr/x86_64-pc-linux-gnu/armv7a-cros-linux-gnueabi/binutils-bin/2.25.51-gold -MMD -MF obj/third_party/angle/src/image_util/angle_image_util.loadimage_sse2.o.d -DV8_DEPRECATION_WARNINGS -D_FILE_OFFSET_BITS=64 -DCHROMIUM_BUILD -DUI_COMPOSITOR_IMAGE_TRANSPORT -DUSE_AURA=1 -DUSE_ASH=1 -DUSE_PANGO=1 -DUSE_CAIRO=1 -DUSE_CRAS=1 -DUSE_DEFAULT_RENDER_THEME=1 -DUSE_LIBJPEG_TURBO=1 -DUSE_X11=1 -DIMAGE_LOADER_EXTENSION=1 -DENABLE_WEBRTC=1 -DENABLE_MEDIA_ROUTER=1 -DENABLE_PEPPER_CDMS -DENABLE_NOTIFICATIONS -DENABLE_WAYLAND_SERVER=1 -DUSE_UDEV -DFIELDTRIAL_TESTING_ENABLED -DENABLE_TASK_MANAGER=1 -DENABLE_EXTENSIONS=1 -DENABLE_PDF=1 -DENABLE_PLUGINS=1 -DENABLE_SESSION_SERVICE=1 -DENABLE_THEMES=1 -DENABLE_PRINTING=1 -DENABLE_PRINT_PREVIEW=1 -DENABLE_SPELLCHECK=1 -DENABLE_CAPTIVE_PORTAL_DETECTION=1 -DENABLE_APP_LIST=1 -DENABLE_SUPERVISED_USERS=1 -DENABLE_MDNS=1 -DENABLE_SERVICE_DISCOVERY=1 -DV8_USE_EXTERNAL_STARTUP_DATA -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DUSE_LIBPCI=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DOS_CHROMEOS=1 -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -Igen -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/angle/src -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/angle/include -Igen/angle -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/angle/include -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/angle/src -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/angle/src/common/third_party/numerics -pthread -fno-strict-aliasing -Wno-extra -Wno-unused-parameter -Wno-missing-field-initializers -fvisibility=hidden -pipe -fPIC -Wno-unused-local-typedefs -Wno-maybe-uninitialized -march=armv7-a -mtune=generic-armv7-a -mfpu=neon -mfloat-abi=hard -mthumb --sysroot=/build/arm-generic -O2 -fno-ident -fdata-sections -ffunction-sections -funwind-tables -gsplit-dwarf -pipe -march=armv7-a -mtune=cortex-a15 -mfpu=neon -mfloat-abi=hard -D__google_stl_debug_vector=1 -fno-exceptions -fno-rtti -fno-threadsafe-statics -fvisibility-inlines-hidden -Wno-deprecated -Wno-abi -std=gnu++11 -Wno-narrowing -Wno-literal-suffix  -c ../../../../../../../home/chrome-bot/chrome_root/src/third_party/angle/src/image_util/loadimage_sse2.cpp -o obj/third_party/angle/src/image_util/angle_image_util.loadimage_sse2.o
chromeos-chrome-54.0.2789.0_rc-r1: ../../../../../../../home/chrome-bot/chrome_root/src/third_party/angle/src/image_util/loadimage_sse2.cpp:17:23: fatal error: emmintrin.h: No such file or directory

chromeos-chrome-54.0.2789.0_rc-r1:  #include <emmintrin.h>

This is the roll that broke it:
https://codereview.chromium.org/2126623002/

This is the roll that fixes it:
https://codereview.chromium.org/2122253002/

We couldn't revert because there were some test expectations that changed in the meantime.

Also, we think this problem might be avoided by the GYP to GN switch that happened late last night, so we triggered another PFQ build on the same branch (2789).