First failing build:
https://uberchromegw.corp.google.com/i/chromiumos.chromium/builders/x86-generic-tot-chromium-pfq-informational/builds/8653

This has the pdfium roll.

Log file:
https://uberchromegw.corp.google.com/i/chromiumos.chromium/builders/x86-generic-tot-chromium-pfq-informational/builds/8653/steps/BuildPackages/logs/stdio

Log snippet:
chromeos-chrome-53.0.2751.0_alpha-r1: FAILED: i686-pc-linux-gnu-g++ -B/usr/x86_64-pc-linux-gnu/i686-pc-linux-gnu/binutils-bin/2.25.51-gold -MMD -MF obj/third_party/pdfium/xfa/fxfa/app/xfa.xfa_textlayout.o.d -DPDF_ENABLE_XFA -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_OZONE=1 -DUSE_DEFAULT_RENDER_THEME=1 -DUSE_LIBJPEG_TURBO=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 -DFT2_BUILD_LIBRARY -DUSE_LIBPCI=1 -DUSE_NSS_CERTS=1 -DOS_CHROMEOS=1 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -D_FORTIFY_SOURCE=2 -Igen -I../../../../../../../home/chrome-bot/chrome_root/src -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/pdfium -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/pdfium/third_party/freetype/include -I../../../../../../../home/chrome-bot/chrome_root/src/third_party/pdfium/third_party/freetype/include/freetype -I../../../../../../../home/chrome-bot/chrome_root/src/v8 -I../../../../../../../home/chrome-bot/chrome_root/src/v8/include -Werror -pthread -fno-strict-aliasing -Wall -Wno-extra -Wno-unused-parameter -Wno-missing-field-initializers -fvisibility=hidden -pipe -fPIC -Wno-unused-local-typedefs -Wno-error=strict-overflow -msse2 -mfpmath=sse -mmmx -m32 --sysroot=/build/x86-generic -O2 -fno-ident -fdata-sections -ffunction-sections -funwind-tables -gsplit-dwarf -march=i686 -pipe -march=i686 -pipe -pipe -march=i686 -mfpmath=sse -mmmx -msse -msse2 -msse3 -D__google_stl_debug_vector=1 -Wno-unknown-warning-option -fno-exceptions -fno-rtti -fno-threadsafe-statics -fvisibility-inlines-hidden -std=gnu++11 -Wno-narrowing -Wno-literal-suffix  -c ../../../../../../../home/chrome-bot/chrome_root/src/third_party/pdfium/xfa/fxfa/app/xfa_textlayout.cpp -o obj/third_party/pdfium/xfa/fxfa/app/xfa.xfa_textlayout.o
chromeos-chrome-53.0.2751.0_alpha-r1: In file included from ../../../../../../../home/chrome-bot/chrome_root/src/third_party/pdfium/core/fxge/include/fx_dib.h:12:0,
chromeos-chrome-53.0.2751.0_alpha-r1:                  from ../../../../../../../home/chrome-bot/chrome_root/src/third_party/pdfium/xfa/fde/css/fde_css.h:10,
chromeos-chrome-53.0.2751.0_alpha-r1:                  from ../../../../../../../home/chrome-bot/chrome_root/src/third_party/pdfium/xfa/fxfa/app/xfa_textlayout.h:13,
chromeos-chrome-53.0.2751.0_alpha-r1:                  from ../../../../../../../home/chrome-bot/chrome_root/src/third_party/pdfium/xfa/fxfa/app/xfa_textlayout.cpp:7:
chromeos-chrome-53.0.2751.0_alpha-r1: ../../../../../../../home/chrome-bot/chrome_root/src/third_party/pdfium/core/fxcrt/include/fx_basic.h: In member function 'void CXFA_TextLayout::ItemBlocks(const CFX_RectF&, int32_t)':
chromeos-chrome-53.0.2751.0_alpha-r1: ../../../../../../../home/chrome-bot/chrome_root/src/third_party/pdfium/core/fxcrt/include/fx_basic.h:229:5: warning: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Wstrict-overflow]
chromeos-chrome-53.0.2751.0_alpha-r1:      if (nIndex < 0 || nIndex >= m_nSize) {
chromeos-chrome-53.0.2751.0_alpha-r1:      ^
chromeos-chrome-53.0.2751.0_alpha-r1: At global scope:
chromeos-chrome-53.0.2751.0_alpha-r1: cc1plus: error: unrecognized command line option "-Wno-unknown-warning-option" [-Werror]
chromeos-chrome-53.0.2751.0_alpha-r1: cc1plus: all warnings being treated as errors