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This CL makes the SharedImageBackingFactoryGLTexture notify the GPU
watchdog that progress is being made around the code that requests
memory allocation or texture upload. This is an attempt to improve the
crash rate due to allocation taking a long time (as opposed to it being
a GPU hang).

Bug: 1082197
Test: added unit test coverage.
Change-Id: Ic9530fd53df95d5ce0b675231c0ac52e682c69e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2215256
Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Maggie Chen <magchen@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813055}