Mac fullscreen low power video: Add FullscreenLowPowerControllerCocoa

ui/accelerated_widget_mac/accelerated_widget_mac.h

Index: ui/accelerated_widget_mac/accelerated_widget_mac.h
diff --git a/ui/accelerated_widget_mac/accelerated_widget_mac.h b/ui/accelerated_widget_mac/accelerated_widget_mac.h
index 3f7cebe7fdd6b02e574edc84419003d5324e01c3..cf26ad6febcb1ff80f1645791d37f31f6bf83dd4 100644
--- a/ui/accelerated_widget_mac/accelerated_widget_mac.h
+++ b/ui/accelerated_widget_mac/accelerated_widget_mac.h
@@ -31,6 +31,7 @@ class SoftwareFrameData;
 namespace ui {
 
 class AcceleratedWidgetMac;
+class FullscreenLowPowerCoordinator;
 
 // A class through which an AcceleratedWidget may be bound to draw the contents
 // of an NSView. An AcceleratedWidget may be bound to multiple different views
@@ -59,6 +60,12 @@ class ACCELERATED_WIDGET_MAC_EXPORT AcceleratedWidgetMac {
   void SetNSView(AcceleratedWidgetMacNSView* view);
   void ResetNSView();
 
+  // Fullscreen low power mode interface.
+  void SetFullscreenLowPowerCoordinator(
+      FullscreenLowPowerCoordinator* coordinator);
+  void ResetFullscreenLowPowerCoordinator();
+  CALayer* GetFullscreenLowPowerLayer() const;
+
   // Return true if the last frame swapped has a size in DIP of |dip_size|.
   bool HasFrameOfSize(const gfx::Size& dip_size) const;
 
@@ -99,6 +106,10 @@ class ACCELERATED_WIDGET_MAC_EXPORT AcceleratedWidgetMac {
   // A phony NSView handle used to identify this.
   gfx::AcceleratedWidget native_widget_;
 
+  // The fullscreen low power coordinator. Weak, reset by
+  // SetFullscreenLowPowerCoordinator when it is destroyed.
+  FullscreenLowPowerCoordinator* fslp_coordinator_ = nullptr;
+
   // A flipped layer, which acts as the parent of the compositing and software
   // layers. This layer is flipped so that the we don't need to recompute the
   // origin for sub-layers when their position changes (this is impossible when