WebPluginContainerImpl::isRectTopmost: Clip query rect to frame.

WebPluginContainerImpl::isRectTopmost: Clip query rect to frame.
Changes isRectTopmost implementation to first clip the query rect to the
frame bounds. If this is empty, return false.

BUG=474836
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196710

[bbudge, 2015-06-08 20:24:32]

bbudge@chromium.org changed reviewers:
+ dcheng@chromium.org

[bbudge, 2015-06-08 20:24:33]

I'm not sure about the semantics of isRectTopmost, but this seems to fix the
problem.

[dcheng, 2015-06-08 20:54:59]

Can you add me to the CC list on the bug? It's hard for me to tell what the fix
is for =)

[bbudge, 2015-06-08 20:56:53]

On 2015/06/08 20:54:59, dcheng wrote:
> Can you add me to the CC list on the bug? It's hard for me to tell what the
fix
> is for =)

Done

[dcheng, 2015-06-08 21:53:42]

lgtm

[bbudge, 2015-06-08 23:37:53]

The CQ bit was checked by bbudge@chromium.org

[commit-bot: I haz the power, 2015-06-08 23:38:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1168173002/1

[commit-bot: I haz the power, 2015-06-08 23:41:45]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196710