Mac Overlays: Add GPU back-pressure

ui/views/cocoa/bridged_native_widget.h

 // 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.
 
 #ifndef UI_VIEWS_COCOA_BRIDGED_NATIVE_WIDGET_H_
 #define UI_VIEWS_COCOA_BRIDGED_NATIVE_WIDGET_H_
 
 #import <Cocoa/Cocoa.h>
 #include <vector>
 
@@ skipping 210 matching lines @@
 
   // Overridden from ui::LayerDelegate:
   void OnPaintLayer(const ui::PaintContext& context) override;
   void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override;
   void OnDeviceScaleFactorChanged(float device_scale_factor) override;
   base::Closure PrepareForLayerBoundsChange() override;
 
   // Overridden from ui::AcceleratedWidgetMac:
   NSView* AcceleratedWidgetGetNSView() const override;
   bool AcceleratedWidgetShouldIgnoreBackpressure() const override;
+  uint32_t AcceleratedWidgetGetDisplayID() const override;
   void AcceleratedWidgetSwapCompleted(
       const std::vector<ui::LatencyInfo>& latency_info) override;
   void AcceleratedWidgetHitError() override;
 
   // Overridden from BridgedNativeWidgetOwner:
   NSWindow* GetNSWindow() override;
   gfx::Vector2d GetChildWindowOffset() const override;
   bool IsVisibleParent() const override;
   void RemoveChildWindow(BridgedNativeWidget* child) override;
 
@@ skipping 38 matching lines @@
   // If true, the window has been made visible or changed shape and the window
   // shadow needs to be invalidated when a frame is received for the new shape.
   bool invalidate_shadow_on_frame_swap_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(BridgedNativeWidget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_COCOA_BRIDGED_NATIVE_WIDGET_H_