content: Add ContextProviderFactory to create a render ContextProvider.

content/browser/gpu/gpu_surface_tracker.cc

 // 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.
 
 #include "content/browser/gpu/gpu_surface_tracker.h"
 
 #include "base/logging.h"
 #include "build/build_config.h"
 
 #if defined(OS_ANDROID)
@@ skipping 18 matching lines @@
 }
 
 int GpuSurfaceTracker::AddSurfaceForNativeWidget(
     gfx::AcceleratedWidget widget) {
   base::AutoLock lock(lock_);
   gpu::SurfaceHandle surface_handle = next_surface_handle_++;
   surface_map_[surface_handle] = widget;
   return surface_handle;
 }
 
+bool GpuSurfaceTracker::IsValidSurfaceHandle(
+    gpu::SurfaceHandle surface_handle) const {
+  return surface_map_.find(surface_handle) != surface_map_.end();
+}
+
 void GpuSurfaceTracker::RemoveSurface(gpu::SurfaceHandle surface_handle) {
   base::AutoLock lock(lock_);
   DCHECK(surface_map_.find(surface_handle) != surface_map_.end());
   surface_map_.erase(surface_handle);
 }
 
 gfx::AcceleratedWidget GpuSurfaceTracker::AcquireNativeWidget(
     gpu::SurfaceHandle surface_handle) {
   base::AutoLock lock(lock_);
   SurfaceMap::iterator it = surface_map_.find(surface_handle);
@@ skipping 13 matching lines @@
   return GetViewSurface(surface_id);
 }
 #endif
 
 std::size_t GpuSurfaceTracker::GetSurfaceCount() {
   base::AutoLock lock(lock_);
   return surface_map_.size();
 }
 
 }  // namespace content