Delete background tab IOSurfaces on Mac.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 8dd248c5533ef786b63425066235d3b8e6ecbbf9..49864b97bf96e34d8f558368e5549e5c64c90545 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -641,6 +641,14 @@ void RenderWidgetHostViewAura::AcceleratedSurfacePostSubBuffer(
 void RenderWidgetHostViewAura::AcceleratedSurfaceSuspend() {
 }
 
+bool RenderWidgetHostViewAura::HasAcceleratedSurface(
+      const gfx::Size& desired_size) {
+  // TODO(jbates) Implement this so this view can use GetBackingStore for both
+  // software and GPU frames. Defaulting to false just makes GetBackingStore
+  // only useable for software frames.

[piman, 2012/04/19 23:58:18]

FYI... at least on Aura we don't want to block waiting on a composited frame, we
have a separate mechanism to delay the UI compositor until we've received it,
but without blocking the thread.

[jbates, 2012/04/20 01:14:04]

Done.

+  return false;
+}
+
 void RenderWidgetHostViewAura::AcceleratedSurfaceNew(
       int32 width,
       int32 height,