content: Add ContextProviderFactory to create a render ContextProvider.

content/browser/gpu/gpu_surface_tracker.cc

Index: content/browser/gpu/gpu_surface_tracker.cc
diff --git a/content/browser/gpu/gpu_surface_tracker.cc b/content/browser/gpu/gpu_surface_tracker.cc
index d04a0e2f4249d3279da4601389e84bd64efbe768..2212a025c374212f0ecaf794f685c3826c9e2bbe 100644
--- a/content/browser/gpu/gpu_surface_tracker.cc
+++ b/content/browser/gpu/gpu_surface_tracker.cc
@@ -36,6 +36,17 @@ int GpuSurfaceTracker::AddSurfaceForNativeWidget(
   return surface_handle;
 }
 
+gpu::SurfaceHandle GpuSurfaceTracker::GetSurfaceForNativeWidget(
+    gfx::AcceleratedWidget widget) {
+  for (SurfaceMap::iterator it = surface_map_.begin(); it != surface_map_.end();
+       ++it) {
+    if (it->second == widget)
+      return it->first;
+  }
+
+  return gpu::kNullSurfaceHandle;
+}
+
 void GpuSurfaceTracker::RemoveSurface(gpu::SurfaceHandle surface_handle) {
   base::AutoLock lock(lock_);
   DCHECK(surface_map_.find(surface_handle) != surface_map_.end());