ozone: Add overlay candidate implementation that queries support via IPC

ui/ozone/public/surface_factory_ozone.h

 // Copyright (c) 2013 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 UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_
 #define UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/native_library.h"
@@ skipping 47 matching lines @@
 class OZONE_BASE_EXPORT SurfaceFactoryOzone {
  public:
   // Describes overlay buffer format.
   // TODO: this is a placeholder for now and will be populated with more
   // formats once we know what sorts of content, video, etc. we can support.
   enum BufferFormat {
     UNKNOWN,
     BGRA_8888,
     RGBX_8888,
     RGB_888,
+    BUFFER_FORMAT_LAST = RGB_888
   };
 
   enum BufferUsage {
     MAP,
     SCANOUT,
   };
 
   typedef void* (*GLGetProcAddressProc)(const char* name);
   typedef base::Callback<void(base::NativeLibrary)> AddGLLibraryCallback;
   typedef base::Callback<void(GLGetProcAddressProc)>
@@ skipping 80 matching lines @@
   // such as MAP for zero copy or SCANOUT for display controller.
   virtual bool CanCreateNativePixmap(BufferUsage usage);
 
  private:
   static SurfaceFactoryOzone* impl_;  // not owned
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_