Parameterize TaskRunner used by ui::Compositor

ui/compositor/test/test_compositor_host_mac.mm

 // Copyright (c) 2012 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 "ui/compositor/test/test_compositor_host.h"
 
 #import <AppKit/NSApplication.h>
 #import <AppKit/NSOpenGL.h>
 #import <AppKit/NSView.h>
 #import <AppKit/NSWindow.h>
 #import <Foundation/NSAutoreleasePool.h>
 
 #include "base/compiler_specific.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
 #include "ui/compositor/compositor.h"
 #include "ui/gfx/rect.h"
 
 // AcceleratedTestView provides an NSView class that delegates drawing to a
 // ui::Compositor delegate, setting up the NSOpenGLContext as required.
 @interface AcceleratedTestView : NSView {
   ui::Compositor* compositor_;
 }
 // Designated initializer.
 -(id)init;
@@ skipping 97 matching lines @@
   window_ = [[NSWindow alloc]
                 initWithContentRect:NSMakeRect(bounds_.x(),
                                                bounds_.y(),
                                                bounds_.width(),
                                                bounds_.height())
                           styleMask:NSBorderlessWindowMask
                             backing:NSBackingStoreBuffered
                               defer:NO];
   base::scoped_nsobject<AcceleratedTestView> view(
       [[AcceleratedTestView alloc] init]);
-  compositor_.reset(new ui::Compositor(view, context_factory_));
+  compositor_.reset(new ui::Compositor(view,
+                                       context_factory_,
+                                       base::MessageLoopProxy::current()));
   compositor_->SetScaleAndSize(1.0f, bounds_.size());
   [view setCompositor:compositor_.get()];
   [window_ setContentView:view];
   [window_ orderFront:nil];
 }
 
 ui::Compositor* TestCompositorHostMac::GetCompositor() {
   return compositor_.get();
 }
 
 // static
 TestCompositorHost* TestCompositorHost::Create(
     const gfx::Rect& bounds,
     ui::ContextFactory* context_factory) {
   return new TestCompositorHostMac(bounds, context_factory);
 }
 
 }  // namespace ui