Revert 287325 because it breaks smoothness benchmarks on windows: "ValueError: LatencyInfo has no b…

Revert 287325 because it breaks smoothness benchmarks on windows: "ValueError: LatencyInfo has no begin component"

> Implement scroll handler latency tracking
> 
> Since scroll handlers do not block composited scrolling, the existing
> input latency metric will only report the response time for the
> compositor when scrolling a page with a handler. This is not accurate
> for pages that implement scroll-synchronized effects, because the
> scroll handler needs to be invoked so that the page contents are
> updated with the new scroll offset.
> 
> This patch fixes the problem by forwarding latency information from the
> impl to the main thread when we are scrolling a layer that has an active
> scroll event handler.
> 
> In the case the scroll handler is no-op, the latency information will be
> terminated as a failed commit.
> 
> Sample trace:
> https://drive.google.com/file/d/0ByyxMXB38gLDRE40bkU5TVd0U00/edit?usp=sharing
> 
> BUG=347366
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=282117
> 
> Review URL: https://codereview.chromium.org/365463003

TBR=skyostil@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287458

[sadrul, 2014-08-05 04:57:55]

Committed patchset #1 manually as r287458.