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This CL reports the latency in case of no begin main frame.
This can happen in any of the scenarios below:

1) WillBeginImplFrame -> DidFinishImplFrame -> DidSubmitCompositorFrame

2) WillBeginImplFrame -> WillBeginMainFrame -> BeginMainFrameAborted ->
DidFinishImplFrame -> DidSubmitCompositorFrame

3) WillBeginImplFrame -> WillBeginMainFrame -> DidFinishImplFrame ->
BeginMainFrameAborted -> DidSubmitCompositorFrame

In these cases there will be no latency to report for stages of:
- SendBeginMainFrameToCommit
- Commit
- EndCommitToActivation
But the latency will be reported for the remaining stages.

Bug: chromium:1003038
Change-Id: Id0d6a65603b2b15a0ee04a6974a4bd0b2a5a803b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1799026
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705964}