Mac: Always use surfaceless mode

content/common/gpu/image_transport_surface_overlay_mac.h

 // Copyright 2015 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 CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_OVERLAY_MAC_H_
 #define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_OVERLAY_MAC_H_
 
 #include <list>
 #include <vector>
 
@@ skipping 79 matching lines @@
   // argument to avoid redundant calls to base::TimeTicks::Now.
   void PostCheckPendingSwapsCallbackIfNeeded(const base::TimeTicks& now);
 
   // Return the time of |interval_fraction| of the way through the next
   // vsync period that starts after |from|. If the vsync parameters are not
   // valid then return |from|.
   base::TimeTicks GetNextVSyncTimeAfter(
       const base::TimeTicks& from, double interval_fraction);
 
   scoped_ptr<ImageTransportHelper> helper_;
+  bool use_remote_layer_api_;
   base::scoped_nsobject<CAContext> ca_context_;
   base::scoped_nsobject<CALayer> ca_root_layer_;
 
   gfx::Size pixel_size_;
   float scale_factor_;
   std::vector<ui::LatencyInfo> latency_info_;
 
   // The renderer ID that all contexts made current to this surface should be
   // targeting.
   GLint gl_renderer_id_;
@@ skipping 22 matching lines @@
   base::TimeTicks vsync_timebase_;
   base::TimeDelta vsync_interval_;
 
   base::Timer display_pending_swap_timer_;
   base::WeakPtrFactory<ImageTransportSurfaceOverlayMac> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_OVERLAY_MAC_H_