Add shared bitmap managers for browser and renderer processes.

cc/output/delegating_renderer.cc

 // Copyright 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 "cc/output/delegating_renderer.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 144 matching lines @@
   ContextProvider* context_provider = output_surface_->context_provider();
   if (!visible_) {
     TRACE_EVENT0("cc", "DelegatingRenderer::SetVisible dropping resources");
     resource_provider_->ReleaseCachedData();
     if (context_provider)
       context_provider->ContextGL()->Flush();
   }
   // We loop visibility to the GPU process, since that's what manages memory.
   // That will allow it to feed us with memory allocations that we can act
   // upon.
-  DCHECK(context_provider);
-  context_provider->ContextSupport()->SetSurfaceVisible(visible);
+  if (context_provider)
+    context_provider->ContextSupport()->SetSurfaceVisible(visible);
 }
 
 void DelegatingRenderer::SendManagedMemoryStats(size_t bytes_visible,
                                                 size_t bytes_visible_and_nearby,
                                                 size_t bytes_allocated) {
   ContextProvider* context_provider = output_surface_->context_provider();
   if (!context_provider) {
     // TODO(piman): software path.
     NOTIMPLEMENTED();
     return;
   }
   gpu::ManagedMemoryStats stats;
   stats.bytes_required = bytes_visible;
   stats.bytes_nice_to_have = bytes_visible_and_nearby;
   stats.bytes_allocated = bytes_allocated;
   stats.backbuffer_requested = false;
 
   context_provider->ContextSupport()->SendManagedMemoryStats(stats);
 }
 
 }  // namespace cc