Android WebView: fix missing an invalidate

Android WebView: fix missing an invalidate

When webview translates into the screen from offscreen by calling
WebView#SetTranslateX/Y, onDrawHardware is called with an empty global
visible rect.
When the webview is still offscreen, Android frameworks won't call
DrawGL on WebView, which means the "parent draw constraints" stored in
hardware renderer won't contain the draw constraints when the webview is
offscreen.
When webview gets an ondraw with an empty global visible rect, we need
to make sure the parent draw constraints of the corresponding DrawGL is
always posted back to child compositor and triggers an invalidate.

BUG=417479
Committed: https://crrev.com/673cf0160d7b5e520841a65f4425f8be1a48fbb1
Cr-Commit-Position: refs/heads/master@{#296589}

[hush (inactive), 2014-09-24 19:33:36]

hush@chromium.org changed reviewers:
+ boliu@chromium.org

[hush (inactive), 2014-09-24 19:33:43]

PTAL

[hush (inactive), 2014-09-24 22:16:02]

just rebased

[boliu, 2014-09-24 22:23:11]

The CQ bit was checked by boliu@chromium.org

[boliu, 2014-09-24 22:23:12]

lgtm

[boliu, 2014-09-24 22:23:21]

The CQ bit was unchecked by boliu@chromium.org

[hush (inactive), 2014-09-24 23:11:09]

The CQ bit was checked by hush@chromium.org

[commit-bot: I haz the power, 2014-09-24 23:12:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/603633003/60001

[commit-bot: I haz the power, 2014-09-24 23:30:37]

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

[commit-bot: I haz the power, 2014-09-24 23:30:38]

Try jobs failed on following builders:
  linux_chromium_gn_dbg on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_gn_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[hush (inactive), 2014-09-24 23:46:31]

The CQ bit was checked by hush@chromium.org

[commit-bot: I haz the power, 2014-09-24 23:48:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/603633003/60001

[commit-bot: I haz the power, 2014-09-25 00:20:10]

Committed patchset #4 (id:60001) as 3df7a42320e01ff50b4ebb7fb6831d8e3b94a84e

[commit-bot: I haz the power, 2014-09-25 00:20:40]

Patchset 4 (id:??) landed as
https://crrev.com/673cf0160d7b5e520841a65f4425f8be1a48fbb1
Cr-Commit-Position: refs/heads/master@{#296589}