Parameterize TaskRunner used by ui::Compositor

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 "base/message_loop/message_loop.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"
 #include "content/browser/renderer_host/software_layer_mac.h"
 #include "content/public/browser/context_factory.h"
 #include "ui/base/cocoa/animation_utils.h"
 #include "ui/gl/scoped_cgl.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserCompositorViewMacInternal
@@ skipping 14 matching lines @@
   [flipped_layer_ setAnchorPoint:CGPointMake(0, 0)];
   [flipped_layer_
       setAutoresizingMask:kCALayerWidthSizable|kCALayerHeightSizable];
 
   // Set the Cocoa view to be hosting the un-flipped background layer (hosting
   // a flipped layer results in unpredictable behavior).
   cocoa_view_.reset([[BrowserCompositorViewCocoa alloc] initWithClient:this]);
 
   // Create a compositor to draw the contents of |cocoa_view_|.
   compositor_.reset(new ui::Compositor(
-      cocoa_view_, content::GetContextFactory()));
+      cocoa_view_,
+      content::GetContextFactory(),
+      base::MessageLoopProxy::current()));
 }
 
 BrowserCompositorViewMacInternal::~BrowserCompositorViewMacInternal() {
   DCHECK(!client_);
   [cocoa_view_ resetClient];
 }
 
 void BrowserCompositorViewMacInternal::SetClient(
     BrowserCompositorViewMacClient* client) {
   // Disable the fade-in animation as the view is added.
@@ skipping 207 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