Notify parent frame renderer when OOP child frame renderer crashes

When an out-of-process iframe renderer crashes, this causes the parent
renderer to be notified and it will display a solid color instead of
the previous rendered texture. This will later be changed to a special
'sad frame' bitmap when OOPIF rendering in Blink is further along.

At the time this is being committed the behavior is not
observable because of an independent crash bug (338508).
Commenting out the following line in
RenderViewHostImpl::OnRenderProcessGone() can avert the
crash (though it breaks other behavior):
delegate_->GetFrameTree()->ResetForMainFrameSwap();

R=jam
BUG=325803

Review URL: https://codereview.chromium.org/147023002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247987 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247987