Add detached mode plumbing

content/common/gpu/image_transport_surface_overlay_mac.h

Index: content/common/gpu/image_transport_surface_overlay_mac.h
diff --git a/content/common/gpu/image_transport_surface_overlay_mac.h b/content/common/gpu/image_transport_surface_overlay_mac.h
index 84527798958cd921083ef4aceaca5c2ec5ee1a63..67d73d48baceb741454a040a5c602f88ba2fbb5d 100644
--- a/content/common/gpu/image_transport_surface_overlay_mac.h
+++ b/content/common/gpu/image_transport_surface_overlay_mac.h
@@ -17,6 +17,7 @@
 #include "ui/gl/gl_surface.h"
 #include "ui/gl/gpu_switching_observer.h"
 
+@class AVSampleBufferDisplayLayer;
 @class CAContext;
 @class CALayer;
 
@@ -76,13 +77,6 @@ class ImageTransportSurfaceOverlayMac : public gfx::GLSurface,
   void BufferPresented(int32_t surface_id,
                        const base::TimeTicks& vsync_timebase,
                        const base::TimeDelta& vsync_interval);
-  void SendAcceleratedSurfaceBuffersSwapped(
-      int32_t surface_id,
-      CAContextID ca_context_id,
-      const gfx::ScopedRefCountedIOSurfaceMachPort& io_surface,
-      const gfx::Size& size,
-      float scale_factor,
-      std::vector<ui::LatencyInfo> latency_info);
   gfx::SwapResult SwapBuffersInternal(const gfx::Rect& pixel_damage_rect);
 
   // Returns true if the front of |pending_swaps_| has completed, or has timed
@@ -119,6 +113,9 @@ class ImageTransportSurfaceOverlayMac : public gfx::GLSurface,
   base::scoped_nsobject<CAContext> ca_context_;
   base::scoped_nsobject<CALayer> ca_root_layer_;
 
+  base::scoped_nsobject<CAContext> detached_ca_context_;
+  base::scoped_nsobject<AVSampleBufferDisplayLayer> detached_av_layer_;
+
   gfx::Size pixel_size_;
   float scale_factor_;