Add detached mode plumbing

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 fea9a515e8d103e0af5024f9730eefd5f39a10b7..7126101b4254b8f79d8e03943914818aaa456821 100644
--- a/ui/accelerated_widget_mac/accelerated_widget_mac.h
+++ b/ui/accelerated_widget_mac/accelerated_widget_mac.h
@@ -10,6 +10,7 @@
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "ui/accelerated_widget_mac/accelerated_widget_mac_export.h"
 #include "ui/base/cocoa/remote_layer_api.h"
@@ -20,6 +21,7 @@
 #if defined(__OBJC__)
 #import <Cocoa/Cocoa.h>
 #import "base/mac/scoped_nsobject.h"
+@class DetachedModeWindow;
 #endif  // __OBJC__
 
 class SkCanvas;
@@ -68,11 +70,20 @@ class ACCELERATED_WIDGET_MAC_EXPORT AcceleratedWidgetMac {
 
   void GotFrame(CAContextID ca_context_id,
                 base::ScopedCFTypeRef<IOSurfaceRef> io_surface,
+                bool use_detached,
+                CAContextID detached_ca_context_id,
                 const gfx::Size& pixel_size,
                 float scale_factor);
 
+  NSWindow* CreateDetachedModeWindow();
+  void DestroyDetachedModeWindow();
+  void EnterDetachedMode();
+  void LeaveDetachedMode();
+
  private:
   void GotCAContextFrame(CAContextID ca_context_id,
+                         bool use_detached,
+                         CAContextID detached_ca_context_id,
                          const gfx::Size& pixel_size,
                          float scale_factor);
 
@@ -95,6 +106,8 @@ class ACCELERATED_WIDGET_MAC_EXPORT AcceleratedWidgetMac {
   // A phony NSView handle used to identify this.
   gfx::AcceleratedWidget native_widget_;
 
+  base::scoped_nsobject<DetachedModeWindow> detached_mode_window_;
+
   // 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
@@ -106,6 +119,8 @@ class ACCELERATED_WIDGET_MAC_EXPORT AcceleratedWidgetMac {
 
   // The accelerated CoreAnimation layer hosted by the GPU process.
   base::scoped_nsobject<CALayerHost> ca_context_layer_;
+  base::scoped_nsobject<CALayerHost> detached_ca_context_layer_;
+  bool in_detached_mode_ = false;
 
   // The locally drawn layer, which has its contents set to an IOSurface.
   base::scoped_nsobject<CALayer> local_layer_;
@@ -113,6 +128,7 @@ class ACCELERATED_WIDGET_MAC_EXPORT AcceleratedWidgetMac {
   // The size in DIP of the last swap received from |compositor_|.
   gfx::Size last_swap_size_dip_;
 
+  base::WeakPtrFactory<AcceleratedWidgetMac> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(AcceleratedWidgetMac);
 };
 
@@ -123,6 +139,8 @@ void AcceleratedWidgetMacGotFrame(
     gfx::AcceleratedWidget widget,
     CAContextID ca_context_id,
     base::ScopedCFTypeRef<IOSurfaceRef> io_surface,
+    bool use_detached,
+    CAContextID detached_ca_context_id,
     const gfx::Size& pixel_size,
     float scale_factor,
     base::TimeTicks* vsync_timebase,