Plumb damage rect to browser compositor.

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 5ce78554ad23e33a7ac26fe368d4fc477323715e..1320715e653b60b4a83415dcf975f36248c1fab2 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -333,9 +333,15 @@ void RenderWidgetHostViewAura::AcceleratedSurfacePostSubBuffer(
     // Must still send the ACK
     RenderWidgetHost::AcknowledgePostSubBuffer(params.route_id, gpu_host_id);
   } else {
-    // TODO(backer): Plumb the damage rect to the ui compositor so that we
-    // can do a partial swap to display.
+#if defined(USE_WEBKIT_COMPOSITOR)
+    window_->layer()->SchedulePaint(gfx::Rect(
+       params.x,
+       window_->layer()->bounds().height() - params.y - params.height,

[piman, 2011/11/30 22:28:44]

Shouldn't that depend on whether or not we need to flip y? I'm tempted to move
that logic inside of Layer, which has the information.

[piman, 2011/12/06 00:46:34]

Ping?

+       params.width,
+       params.height));
+#else
     window_->layer()->ScheduleDraw();
+#endif
 
     // Add sending an ACK to the list of things to do OnCompositingEnded
     on_compositing_ended_callbacks_.push_back(