Use the pinch viewport offset for tap disambiguation.

Use the pinch viewport offset for tap disambiguation.

Obtain the inner viewport origin, touch and target rectangles
from the Blink relative to the outer viewport.
Use the zoom rectangle in the outer viewport coordinates for bitmap
generation but the inner viewport coordinates for the calculation
of the physical window zoom rect.

This change is part 2 of 2 (part 1 is Blink side change https://codereview.chromium.org/584893004).

BUG=370470
Committed: https://crrev.com/29a8d0f6913edc6afb99d1dda3f3f35eb96b8c0a
Cr-Commit-Position: refs/heads/master@{#296786}

[timav, 2014-09-22 23:49:55]

timav@google.com changed reviewers:
+ aelias@chromium.org, bokan@chromium.org, timav@google.com

[timav, 2014-09-22 23:49:55]

Part 2: chromium.

[aelias_OOO_until_Jul13, 2014-09-23 23:19:58]

aelias@chromium.org changed reviewers:
+ jamesr@chromium.org

[aelias_OOO_until_Jul13, 2014-09-23 23:19:59]

lgtm, adding jamesr@ for content/renderer OWNERS.

(BTW James, I do intend to move this away from paintCompositedDeprecated
eventually.  This coordinate change is orthogonal and should still be useful in
the future way to do things.)

[jamesr, 2014-09-23 23:26:37]

lgtm

[timav, 2014-09-25 20:39:16]

The CQ bit was checked by timav@google.com

[commit-bot: I haz the power, 2014-09-25 20:40:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/595693002/1

[commit-bot: I haz the power, 2014-09-25 20:46:02]

Committed patchset #1 (id:1) as 58f385969a865d34ae1f3ce67398619e7009bcca

[commit-bot: I haz the power, 2014-09-25 20:47:17]

Patchset 1 (id:??) landed as
https://crrev.com/29a8d0f6913edc6afb99d1dda3f3f35eb96b8c0a
Cr-Commit-Position: refs/heads/master@{#296786}