aura: Defer OutputSurface creation until widget is available

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>
@@ skipping 115 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_.SetAcceleratedWidgetAndStartCompositor(view);
+  compositor_.SetAcceleratedWidget(view);
   compositor_.SetScaleAndSize(1.0f, bounds_.size());
   [view setCompositor:&compositor_];
   [window_ setContentView:view];
   [window_ orderFront:nil];
 }
 
 ui::Compositor* TestCompositorHostMac::GetCompositor() {
   return &compositor_;
 }
 
 // static
 TestCompositorHost* TestCompositorHost::Create(
     const gfx::Rect& bounds,
     ui::ContextFactory* context_factory) {
   return new TestCompositorHostMac(bounds, context_factory);
 }
 
 }  // namespace ui