Exit HTML Fullscreen when browser fullscreen is active.

Exit HTML Fullscreen when browser fullscreen is active.

Ensure web contents exit fullscreen state by sending a resize message, which includes the fullscreen state. This is required for the situation of the browser moving the view into a fullscreen state "browser fullscreen" and then the contents entering "tab fullscreen". Exiting the contents "tab fullscreen" then won't have the side effect of the view resizing, hence the explicit call here is required.

Fixes a regression caused in the refactoring
 Fullscreen: make fullscreen requests come from RenderFrame
 https://codereview.chromium.org/789533002
 https://crrev.com/7a78d6fd7dc3241a91a614a09f9c59a0e4454135
where the previous implementation's call to WasResized in
RenderViewHostImpl::OnToggleFullscreen was not brought forward to
WebContentsImpl::ExitFullscreenMode().

BUG=458013
TEST=Open http://scheib.github.io/HTMLMisc/PointerLockAndFullscreen.html, enter Browser Fullscreen with F11 key, press Toggle Fullscreen button, press ESC key, expect content to exit fullscreen.

Committed: https://crrev.com/3dcb6c931a974f4e825f5383e98ed5b958819b56
Cr-Commit-Position: refs/heads/master@{#317562}

[scheib, 2015-02-14 00:41:12]

scheib@chromium.org changed reviewers:
+ jam@chromium.org

[scheib, 2015-02-14 00:41:12]

Regression fix for M42

[jam, 2015-02-17 16:50:00]

On 2015/02/14 00:41:12, scheib wrote:
> Regression fix for M42

really a regression fix should come with a test, and be sent to whoever reviewed
the change.

[scheib, 2015-02-17 17:30:31]

scheib@chromium.org changed reviewers:
+ jochen@chromium.org
- jam@chromium.org

[scheib, 2015-02-17 17:30:31]

jochen, PTAL as initial reviewer of regression.

Re jam, tests: Fullscreen features tests are performed manually after
realization that relying on OS behavior doesn't provide 99.99+% reliability and
thus is too noisy for automation.

[jochen (gone - plz use gerrit), 2015-02-23 09:50:08]

code lgtm

only having manual tests is very sad :(

[mlamouri (slow - plz ping), 2015-02-23 10:23:07]

The CQ bit was checked by mlamouri@chromium.org

[commit-bot: I haz the power, 2015-02-23 10:23:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/928673002/1

[commit-bot: I haz the power, 2015-02-23 10:56:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-23 10:56:47]

Patchset 1 (id:??) landed as
https://crrev.com/3dcb6c931a974f4e825f5383e98ed5b958819b56
Cr-Commit-Position: refs/heads/master@{#317562}