[Android] Revert for regression where gestures interrupted on page load

[Android] Revert for regression where gestures interrupted on page load

This is a partial revert of https://codereview.chromium.org/120203003.
It is quite common for a page to generate multiple |DidStartLoading()|
notifications while it finishes loading.  Redundant notifications should
not reset a gesture mid-sequence.

BUG=335586
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245630

[jdduke (slow), 2014-01-17 18:10:08]

wangxianzhu@: PTAL.  It's really quite odd that we get so many spammy
|DidStartLoading()| notifications.  I tried to find a better hook from
WebContentsObserver, but all of the "start"-related notifications seem to be
called multiple times while a page loads.  In any case, this revert fixes the
regression, and perhaps we can look for a better alternative in the future.

[Xianzhu, 2014-01-17 18:32:06]

lgtm.

It's interesting that didStartLoading is called multiple times. Perhaps it's
also called for subdocuments. Will have a look at it.

[jdduke (slow), 2014-01-17 18:36:51]

On 2014/01/17 18:32:06, Xianzhu wrote:
> lgtm.
> 
> It's interesting that didStartLoading is called multiple times. Perhaps it's
> also called for subdocuments. Will have a look at it.

Could you? That would be great, thanks.  I was seeing all sorts of
"DidStart/Finish" calls after the page had loaded (or rather, the progress
indicator had just stopped...), and didn't immediately notice a more appropriate
listener method.

[commit-bot: I haz the power, 2014-01-17 18:37:16]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jdduke@chromium.org/141853002/30001

[commit-bot: I haz the power, 2014-01-17 20:30:49]

Retried try job too often on win_rel for step(s) nacl_integration
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2014-01-17 20:42:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jdduke@chromium.org/141853002/30001

[commit-bot: I haz the power, 2014-01-17 21:51:01]

Change committed as 245630