Add alpha argument to glResizeCHROMIUM

This lets the compositor specify whether the backbuffer will need to be blended with the contents behind it, and if not it can use a method that uses less power.

BUG=561185
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1474873003

Cr-Commit-Position: refs/heads/master@{#362817}


CrOS-Libchrome-Original-Commit: 8046f1cbb18126cd9ea1a405c93e545f2c377978
3 files changed
tree: 0ad648bd453f0fbb35ea865516a311c90ed6861a
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/