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With this patch, pixels appear on screen and tab capture works.

Add a OnNativeSurfaceBuffersSwapped mechanism to display
an IOSurface to an NSView. This is wired up to the existing
CompositingIOSurfaceMac. In a future refactoring, something
much more light-weight than CompositingIOSurfaceMac will
be used (CompositingIOSurfaceMac has capture code, etc, in
it).

Add a DelegatedFrameHost to RenderWidgetHostViewMac, and
hookup the DelegatedFrameHostClient implementation. Create
the DelegatedFrameHost when a delegated frame is received, and
use its existence to determine which mode is active.

BUG=314190

Review URL: https://codereview.chromium.org/267073003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269946 0039d316-1c4b-4281-b951-d872f2087c98