Workaround qualcomm-specific activity restore bug

Workaround qualcomm-specific activity restore bug

When an activity containing hardware webview is restored
from a different activity in the process, corruption
happens, appearing to be caused by some persistent buffer
failing to persist. Workaround by force invalidating the
whole view tree once an activity is restored.

Limit original glBindRenderbufferEXT workaround to
teardown (ie kModeProcess). This is still needed for
when the restored activity contains no webview. Should be
faster than previous implementation since it's not
on every frame.

BUG=434570
Committed: https://crrev.com/cd52509317c6ed6e345999ca1df81f46ac0a327f
Cr-Commit-Position: refs/heads/master@{#331435}

[boliu, 2015-05-23 00:40:32]

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

[hush (inactive), 2015-05-26 17:33:17]

lgtm

[boliu, 2015-05-26 19:17:46]

Please restamp PS4

[boliu, 2015-05-26 20:49:57]

smaller change in PS5, as discussed

[hush (inactive), 2015-05-26 20:53:39]

lgtm

[boliu, 2015-05-26 20:54:36]

The CQ bit was checked by boliu@chromium.org

[commit-bot: I haz the power, 2015-05-26 20:56:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151783003/80001

[commit-bot: I haz the power, 2015-05-26 21:10:16]

Committed patchset #5 (id:80001)

[commit-bot: I haz the power, 2015-05-26 21:11:02]

Patchset 5 (id:??) landed as
https://crrev.com/cd52509317c6ed6e345999ca1df81f46ac0a327f
Cr-Commit-Position: refs/heads/master@{#331435}