content: Add ContextProviderFactory to create a render ContextProvider.

content/browser/gpu/gpu_surface_tracker.h

 // Copyright (c) 2012 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_GPU_GPU_SURFACE_TRACKER_H_
 #define CONTENT_BROWSER_GPU_GPU_SURFACE_TRACKER_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 30 matching lines @@
 #if defined(OS_ANDROID)
   gl::ScopedJavaSurface AcquireJavaSurface(int surface_id) override;
 #endif
 
   // Gets the global instance of the surface tracker.
   static GpuSurfaceTracker* Get() { return GetInstance(); }
 
   // Adds a surface for a native widget. Returns the surface ID.
   int AddSurfaceForNativeWidget(gfx::AcceleratedWidget widget);
 
+  // Return true if the surface handle is registered with the tracker.
+  bool IsValidSurfaceHandle(gpu::SurfaceHandle surface_handle) const;
+
   // Removes a given existing surface.
   void RemoveSurface(gpu::SurfaceHandle surface_handle);
 
   // Returns the number of surfaces currently registered with the tracker.
   std::size_t GetSurfaceCount();
 
   // Gets the global instance of the surface tracker. Identical to Get(), but
   // named that way for the implementation of Singleton.
   static GpuSurfaceTracker* GetInstance();
 
  private:
   typedef std::map<gpu::SurfaceHandle, gfx::AcceleratedWidget> SurfaceMap;
 
   friend struct base::DefaultSingletonTraits<GpuSurfaceTracker>;
 
   GpuSurfaceTracker();
   ~GpuSurfaceTracker() override;
 
   base::Lock lock_;
   SurfaceMap surface_map_;
   int next_surface_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuSurfaceTracker);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_GPU_SURFACE_TRACKER_H_