Avoid destroying surface before the parent surface stops referencing it.

ui/compositor/test/in_process_context_factory.h

 // Copyright 2014 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_COMPOSITOR_TEST_IN_PROCESS_CONTEXT_FACTORY_H_
 #define UI_COMPOSITOR_TEST_IN_PROCESS_CONTEXT_FACTORY_H_
 
 #include "ui/compositor/compositor.h"
 
 namespace base {
@@ skipping 22 matching lines @@
       Compositor* mirrored_compositor,
       Layer* mirroring_layer) override;
   virtual void RemoveReflector(scoped_refptr<Reflector> reflector) override;
 
   virtual scoped_refptr<cc::ContextProvider> SharedMainThreadContextProvider()
       override;
   virtual void RemoveCompositor(Compositor* compositor) override;
   virtual bool DoesCreateTestContexts() override;
   virtual cc::SharedBitmapManager* GetSharedBitmapManager() override;
   virtual base::MessageLoopProxy* GetCompositorMessageLoop() override;
+  virtual scoped_ptr<cc::SurfaceIdAllocator> CreateSurfaceIdAllocator()
+      override;
 
  private:
   scoped_ptr<base::Thread> compositor_thread_;
   scoped_refptr<webkit::gpu::ContextProviderInProcess>
       shared_main_thread_contexts_;
   scoped_ptr<cc::SharedBitmapManager> shared_bitmap_manager_;
+  uint32_t next_surface_id_namespace_;
 
   DISALLOW_COPY_AND_ASSIGN(InProcessContextFactory);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_TEST_IN_PROCESS_CONTEXT_FACTORY_H_