Fixes for nonmodal pinch zoom.

Fixes for nonmodal pinch zoom.

In Android 4.2, pinch gestures send both pinch events (for the
zoom-in/out part of the pinch) and scroll events (for double-finger
panning).  The previous logic in LayerTreeHostImpl created a pan from
the pinch event, resulting in 2x overpanning on Android 4.2.

In order to have compatible gesture generation in older Android versions as
well, I copy-pasted the latest Android GestureDetector.java file into the
Chromium tree and use that instead of the system file.

BUG=161909
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=168721

[aelias_OOO_until_Jul13, 2012-11-19 21:44:27]

Hi Robert.  This will break ChromeOS until you update your gesture detector to
behave similarly.  But the breakage will be minor -- zooming will still work,
just not 2-finger pans.  I would have fixed ChromeOS as part of this patch but I
have no means of testing the change.

[klobag.chromium, 2012-11-19 22:14:22]

lgtm

[danakj, 2012-11-19 22:19:30]

Do we have a ChromeOS fix underway?

[rjkroege, 2012-11-19 22:32:06]

On 2012/11/19 22:19:30, danakj wrote:
> Do we have a ChromeOS fix underway?

AFAIK: this change was already wired into the GR.  The pinch code in CrOS might
need adjustments.

lgtm.

[danakj, 2012-11-19 22:46:20]

ok, cc/ LGTM

[commit-bot: I haz the power, 2012-11-19 23:20:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/11299083/2001

[commit-bot: I haz the power, 2012-11-19 23:20:30]

Presubmit check for 11299083-2001 failed and returned exit status 1.


Running presubmit commit checks ...

** Presubmit Messages **
If this change has an associated bug, add BUG=[bug number].

** Presubmit ERRORS **
Missing LGTM from an OWNER for files in these directories:
    content/public/android

[aelias_OOO_until_Jul13, 2012-11-19 23:35:10]

tedchoc@, could you give OWNERS approval?

[Ted C, 2012-11-19 23:38:39]

lgtm

[commit-bot: I haz the power, 2012-11-19 23:42:10]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/11299083/2001

[commit-bot: I haz the power, 2012-11-20 00:14:15]

Sorry for I got bad news for ya.
Compile failed with a clobber build on android_dbg.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=android_db...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2012-11-20 00:27:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/11299083/7003

[commit-bot: I haz the power, 2012-11-20 00:59:46]

Retried try job too often for step(s) build

[commit-bot: I haz the power, 2012-11-20 01:15:35]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/11299083/10003

[commit-bot: I haz the power, 2012-11-20 04:11:59]

Change committed as 168721