CrOS: Set max frames pending for UI from command line.

content/renderer/gpu/compositor_output_surface.cc

Index: content/renderer/gpu/compositor_output_surface.cc
diff --git a/content/renderer/gpu/compositor_output_surface.cc b/content/renderer/gpu/compositor_output_surface.cc
index da0bd2a87607a19343181c0a9ad2ef1c38a8dcc9..942b3a182ab113a8fbbc80d11f74b96269c9e357 100644
--- a/content/renderer/gpu/compositor_output_surface.cc
+++ b/content/renderer/gpu/compositor_output_surface.cc
@@ -65,6 +65,8 @@ CompositorOutputSurface::CompositorOutputSurface(
   CommandLine* command_line = CommandLine::ForCurrentProcess();
   capabilities_.has_parent_compositor = command_line->HasSwitch(
       switches::kEnableDelegatedRenderer);
+  if (capabilities_.has_parent_compositor)
+    capabilities_.max_frames_pending = 1;

[piman, 2013/03/13 15:55:22]

This logic should stay inside the compositor. It's necessary (at least
currently) for correctness of the DelegatingRenderer, so I'd rather not rely on
the embedder to do the right thing (which may change in the future).

[jonathan.backer, 2013/03/13 16:55:29]

Done.

   DetachFromThread();
 }