Cherry pick PR #2586: Add telemetry for SourceBuffer.appendBuffer
#2629
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Refer to the original PR: #2586
Modifies the SourceBufferMetrics class to not be completely stubbed out in gold builds, and use it to send UMA histograms for the time spent in
SourceBuffer::PrepareAppend
andSourceBufferAppendAlgorithm::Process
.Added basic unit tests for the
SourceBufferMetrics
class, to assert that the new code reports telemetry against the correct histograms.b/329439818
Change-Id: I7921434b02c689b645ab2a60464eee166d829135