* Update gflags to newer repository location (plain copy
  from the files in WebRTC).
* Add workarounds for mojo dependency (see
  http://bugs.webrtc.org/5629 for more details).
* Update libyuv_unittest to generate user friendly
  run-scripts for Android in out/{Debug,Release}/bin
* Fix Android test execution by adding explicit dependency
  on Chromium's base/base.gyp:base_build_config_gen

This roll also solves the compile problem for Mac ASan bots.

Change log: https://chromium.googlesource.com/chromium/src/+log/1d144ca7f86..2a818f5413
Full diff: https://chromium.googlesource.com/chromium/src/+/1d144ca7f86..2a818f5413

R=magjed@chromium.org
TBR=fbarchard@chromium.org

Review URL: https://codereview.chromium.org/2001173003 .