Mac: Always use surfaceless mode

content/browser/compositor/buffer_queue.h

 // 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.
 
 #ifndef CONTENT_BROWSER_COMPOSITOR_BUFFER_QUEUE_H_
 #define CONTENT_BROWSER_COMPOSITOR_BUFFER_QUEUE_H_
 
 #include <queue>
 #include <vector>
 
+#include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace cc {
 class ContextProvider;
 }
 
+namespace gfx {
+class GpuMemoryBuffer;
+}
+
 namespace content {
 
 class BrowserGpuMemoryBufferManager;
 class GLHelper;
 
 // Provides a surface that manages its own buffers, backed by GpuMemoryBuffers
 // created using CHROMIUM_gpu_memory_buffer_image. Double/triple buffering is
 // implemented internally. Doublebuffering occurs if PageFlipComplete is called
 // before the next BindFramebuffer call, otherwise it creates extra buffers.
 class CONTENT_EXPORT BufferQueue {
@@ skipping 14 matching lines @@
   void Reshape(const gfx::Size& size, float scale_factor);
 
   void RecreateBuffers();
 
   unsigned int current_texture_id() const { return current_surface_.texture; }
   unsigned int fbo() const { return fbo_; }
 
  private:
   friend class BufferQueueTest;
 
-  struct AllocatedSurface {
-    AllocatedSurface() : texture(0), image(0) {}
-    AllocatedSurface(unsigned int texture,
+  struct CONTENT_EXPORT AllocatedSurface {
+    AllocatedSurface();
+    AllocatedSurface(scoped_ptr<gfx::GpuMemoryBuffer> buffer,
+                     unsigned int texture,
                      unsigned int image,
-                     const gfx::Rect& rect)
-        : texture(texture), image(image), damage(rect) {}
+                     const gfx::Rect& rect);
+    ~AllocatedSurface();
+    // TODO(ccameron): Change this to be a scoped_ptr, and change all use of
+    // AllocatedSurface to use scoped_ptr as well.
+    linked_ptr<gfx::GpuMemoryBuffer> buffer;
     unsigned int texture;
     unsigned int image;
     gfx::Rect damage;  // This is the damage for this frame from the previous.
   };
 
   void FreeAllSurfaces();
 
   void FreeSurface(AllocatedSurface* surface);
 
   // Copy everything that is in |copy_rect|, except for what is in
@@ skipping 23 matching lines @@
   GLHelper* gl_helper_;
   BrowserGpuMemoryBufferManager* gpu_memory_buffer_manager_;
   int surface_id_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_BUFFER_QUEUE_H_