Update Memory.RendererUsed only after Blink is initialized

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 3bc7f9dc887ef8e135bdc1605eab2820c33b6e6e..5a679b764d4dbc302ddb8c719df8d766b26ba46b 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -89,6 +89,7 @@ class IndexedDBDispatcher;
 class InputEventFilter;
 class InputHandlerManager;
 class MediaStreamCenter;
+class MemoryObserver;
 class PeerConnectionDependencyFactory;
 class MidiMessageFilter;
 class NetInfoDispatcher;
@@ -567,6 +568,8 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
   // backed GpuMemoryBuffers prevent this. crbug.com/325045
   base::ThreadChecker allocate_gpu_memory_buffer_thread_checker_;
 
+  scoped_ptr<MemoryObserver> memory_observer_;
+
   // Compositor settings
   bool is_gpu_rasterization_enabled_;
   bool is_gpu_rasterization_forced_;