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RenderWidgetHostViewBase::GetLocalSurfaceId passed the viz::LocalSurfaceId
by value.

LocalSurfaceId is large and so copying it around is expensive.
This CL returns a const ref of LocalSurfaceId instead to reduce copying.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Ic775202ef5572676e056bd41419edbaefb7e44da

Bug: 672962
Change-Id: Ic775202ef5572676e056bd41419edbaefb7e44da
Reviewed-on: https://chromium-review.googlesource.com/1141990Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576281}