Mac: Fix janky YouTube animations

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 800693e55152609bc6a829a1dfc7c09f0de4f255..213cbd15f07502c3ffdfa372c688b951255a71f2 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -1779,8 +1779,8 @@ void RenderWidgetHostViewMac::AcceleratedSurfacePostSubBuffer(
 }
 
 void RenderWidgetHostViewMac::AcceleratedSurfaceSuspend() {

[ccameron, 2014/07/22 06:40:42]

I grabbed this while in the neighborhood. It made reasoning about what state is
allocated much easier (in practice, non-delegated rendering, which is the only
place this is used, is likely to remain dead code and eventually be eliminated
entirely).

-  if (compositing_iosurface_)
-    compositing_iosurface_->UnrefIOSurface();
+  if (render_widget_host_->is_hidden())
+    DestroyCompositedIOSurfaceAndLayer();
 }
 
 void RenderWidgetHostViewMac::AcceleratedSurfaceRelease() {
@@ -2179,7 +2179,7 @@ void RenderWidgetHostViewMac::PauseForPendingResizeOrRepaintsAndDraw() {
   // to keep the window and the window's contents in sync.
   [cocoa_view_ displayIfNeeded];
   [software_layer_ displayIfNeeded];
-  [compositing_iosurface_layer_ displayIfNeeded];
+  [compositing_iosurface_layer_ displayIfNeededAndAck];
 }
 
 void RenderWidgetHostViewMac::LayoutLayers() {
@@ -2223,8 +2223,7 @@ void RenderWidgetHostViewMac::LayoutLayers() {
       // displayed. Calling displayIfNeeded will ensure that the right size
       // frame is drawn to the screen.
       // http://crbug.com/350817
-      [compositing_iosurface_layer_ setNeedsDisplay];
-      [compositing_iosurface_layer_ displayIfNeeded];
+      [compositing_iosurface_layer_ setNeedsDisplayAndDisplayAndAck];
     }
   }
 }