Mac Overlays: Wire up overlays on Mac

ui/accelerated_widget_mac/accelerated_widget_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 "ui/accelerated_widget_mac/accelerated_widget_mac.h"
 
 #include <map>
 
 #include "base/lazy_instance.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 41 matching lines @@
   flipped_layer_.reset([[CALayer alloc] init]);
   [flipped_layer_ setGeometryFlipped:YES];
   [flipped_layer_ setAnchorPoint:CGPointMake(0, 0)];
   [flipped_layer_
       setAutoresizingMask:kCALayerWidthSizable|kCALayerHeightSizable];
 
   // Use a sequence number as the accelerated widget handle that we can use
   // to look up the internals structure.
   static uintptr_t last_sequence_number = 0;
   last_sequence_number += 1;
-  native_widget_ = reinterpret_cast<gfx::AcceleratedWidget>(
-      last_sequence_number);
+  native_widget_ = last_sequence_number;
   g_widget_to_helper_map.Pointer()->insert(
       std::make_pair(native_widget_, this));
 }
 
 AcceleratedWidgetMac::~AcceleratedWidgetMac() {
   DCHECK(!view_);
   g_widget_to_helper_map.Pointer()->erase(native_widget_);
 }
 
 void AcceleratedWidgetMac::SetNSView(AcceleratedWidgetMacNSView* view) {
@@ skipping 309 matching lines @@
 
 void AcceleratedWidgetMacGotSoftwareFrame(
     gfx::AcceleratedWidget widget, float scale_factor, SkCanvas* canvas) {
   AcceleratedWidgetMac* accelerated_widget_mac =
       GetHelperFromAcceleratedWidget(widget);
   if (accelerated_widget_mac)
     accelerated_widget_mac->GotSoftwareFrame(scale_factor, canvas);
 }
 
 }  // namespace ui