Add camera_to_webgl perf test to ToughWebglCases

This adds a new perf test case for camera-to-WebGL uploads.
This new case is intended to detect the performance improvements
being made in issue 867368.

Bug: 867368
Change-Id: Ia8b05f422e15bb7625491ac10f33903dcc1c55d0
Reviewed-on: https://chromium-review.googlesource.com/1170033
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583957}
9 files changed