Mac: Fix janky YouTube animations

content/browser/compositor/browser_compositor_view_private_mac.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/compositor/browser_compositor_view_private_mac.h"
 
 #include "base/debug/trace_event.h"
 #include "content/browser/compositor/gpu_process_transport_factory.h"
 #include "content/browser/renderer_host/compositing_iosurface_context_mac.h"
 #include "content/browser/renderer_host/compositing_iosurface_mac.h"
@@ skipping 129 matching lines @@
   // Set the bounds of the accelerated layer to match the size of the frame.
   // If the bounds changed, force the content to be displayed immediately.
   CGRect new_layer_bounds = CGRectMake(
     0,
     0,
     [accelerated_layer_ iosurface]->dip_io_surface_size().width(),
     [accelerated_layer_ iosurface]->dip_io_surface_size().height());
   bool bounds_changed = !CGRectEqualToRect(
       new_layer_bounds, [accelerated_layer_ bounds]);
   [accelerated_layer_ setBounds:new_layer_bounds];
-  if (bounds_changed) {
-    [accelerated_layer_ setNeedsDisplay];
-    [accelerated_layer_ displayIfNeeded];
-  }
+  if (bounds_changed)
+    [accelerated_layer_ setNeedsDisplayAndDisplayAndAck];
 
   // If there was a software layer or an old accelerated layer, remove it.
   // Disable the fade-out animation as the layer is removed.
   {
     [software_layer_ removeFromSuperlayer];
     software_layer_.reset();
     [old_accelerated_layer resetClient];
     [old_accelerated_layer removeFromSuperlayer];
     old_accelerated_layer.reset();
   }
@@ skipping 98 matching lines @@
 - (void)gotSoftwareFrame:(cc::SoftwareFrameData*)frame_data
          withScaleFactor:(float)scale_factor
               withCanvas:(SkCanvas*)canvas {
   if (!client_)
     return;
   client_->GotSoftwareFrame(frame_data, scale_factor, canvas);
 }
 
 @end  // BrowserCompositorViewCocoa