It looks like our linux_layout_tests_slimming_paint_v2 bot has some git config issue:
Failed to apply patch for third_party/WebKit/Source/platform/graphics/paint/PaintController.h:
While running git apply --index -3 -p1 --verbose;
  Checking patch third_party/WebKit/Source/platform/graphics/paint/PaintController.h...
  error: third_party/WebKit/Source/platform/graphics/paint/PaintController.h: does not exist in index

Bot history:
https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_layout_tests_slimming_paint_v2

Because this bot is used for all paint/graphics patches, it is blocking the CQ for our team.