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There's really no reason for us to be posting this for every single
Render() call. They can be updated nearly as quickly during each
FrameReady() call. There's also no reason for us to create a new
PipelineStatistics structure every time either. Instead replace
a multitude of member variables with a PipelineStatistics member.

This is an optimization of PipelineStatistics usage so that we
can add a Decoder enum value later.

BUG=793151
TEST=existing tests pass.

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I5375acf74a625e1095e6631e177b4a04a4a0e54d
Reviewed-on: https://chromium-review.googlesource.com/816019Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523171}