Revert of Implement scroll handler latency tracking

Revert of Implement scroll handler latency tracking (https://codereview.chromium.org/365463003/)

Reason for revert:
Breaks smoothness benchmarks on windows:
"ValueError: LatencyInfo has no begin component"

http://chromegw/i/chromium.perf/builders/Win%207%20Intel%20GPU%20Perf/builds/16918/steps/smoothness.top_25/logs/stdio

TBR=rschoen@chromium.org

Original issue's description:
> 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
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287325

[tonyg, 2014-08-04 19:26:46]

Created Revert of Implement scroll handler latency tracking

[commit-bot: I haz the power, 2014-08-04 19:28:40]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tonyg@chromium.org/437163007/1

[commit-bot: I haz the power, 2014-08-04 19:28:40]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-04 19:28:42]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[tonyg, 2014-08-04 19:56:36]

The CQ bit was checked by tonyg@chromium.org

[commit-bot: I haz the power, 2014-08-04 19:59:02]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tonyg@chromium.org/437163007/1

[commit-bot: I haz the power, 2014-08-04 23:10:30]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel/...)
  win_chromium_x64_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[commit-bot: I haz the power, 2014-08-04 23:18:56]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-04 23:18:57]

Try jobs failed on following builders:
  win_chromium_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel/...)

[sadrul, 2014-08-05 05:00:52]

On 2014/08/04 23:18:57, I haz the power (commit-bot) wrote:
> Try jobs failed on following builders:
>   win_chromium_rel on tryserver.chromium.win
>
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel/...)

Revert drover-landed in crrev.com/287458

[jdduke (slow), 2014-11-13 01:28:44]

jdduke@chromium.org changed reviewers:
- jdduke@chromium.org