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The component-id for BEGIN_RWH component is currently generated from the
process-id and routing-id of the associated RenderWidgetHostImpl, so
that it is possible to find the RenderWidgetHostImpl from the
LatencyInfo after gpu-swap happens. However, the BEGIN_RWH component is
unused at that time (only LatencyInfos that have snapshot requests are
processed after gpu-swap, and the snapshot requests already carry the
identifier for the RenderWidgetHostImpl separately), except for in a
test. So, the changes in this CL:
 . Use zero as the component-id for BEGIN_RWH component.
 . Introduce a SetLatencyInfoProcessorForTesting() method to install a
   callback that receives all the LatencyInfo after a gpu-swap happens,
   and use that in the tests that needed this.

BUG=849729

Change-Id: I19beb790931cfe8e708d0eb4223a3ba23d51e4c1
Reviewed-on: https://chromium-review.googlesource.com/1089583Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565488}