Mac Overlays: Add GPU back-pressure

ui/views/cocoa/bridged_native_widget.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.
 
 #import "ui/views/cocoa/bridged_native_widget.h"
 
 #import <objc/runtime.h>
 
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
@@ skipping 844 matching lines @@
 // BridgedNativeWidget, AcceleratedWidgetMac:
 
 NSView* BridgedNativeWidget::AcceleratedWidgetGetNSView() const {
   return compositor_superview_;
 }
 
 bool BridgedNativeWidget::AcceleratedWidgetShouldIgnoreBackpressure() const {
   return true;
 }
 
+uint32_t BridgedNativeWidget::AcceleratedWidgetGetDisplayIDForVSync() const {
+  return 0;
+}
+
 void BridgedNativeWidget::AcceleratedWidgetSwapCompleted(
     const std::vector<ui::LatencyInfo>& latency_info) {
   // Ignore frames arriving "late" for an old size. A frame at the new size
   // should arrive soon.
   if (!compositor_widget_->HasFrameOfSize(GetClientAreaSize()))
     return;
 
   if (invalidate_shadow_on_frame_swap_) {
     invalidate_shadow_on_frame_swap_ = false;
     [window_ invalidateShadow];
@@ skipping 210 matching lines @@
   [bridged_view_ setMouseDownCanMoveWindow:draggable];
   // AppKit will not update its cache of mouseDownCanMoveWindow unless something
   // changes. Previously we tried adding an NSView and removing it, but for some
   // reason it required reposting the mouse-down event, and didn't always work.
   // Calling the below seems to be an effective solution.
   [window_ setMovableByWindowBackground:NO];
   [window_ setMovableByWindowBackground:YES];
 }
 
 }  // namespace views