[DevTools] Send ack early when paused in mouse move to keep events coming.

content/renderer/devtools/devtools_agent.h

Index: content/renderer/devtools/devtools_agent.h
diff --git a/content/renderer/devtools/devtools_agent.h b/content/renderer/devtools/devtools_agent.h
index 5fd85bc4ebb0c71be3437b07a4002eb1e329a9cf..2ce65849b0f163fb5e5d3726c9175b77d1693643 100644
--- a/content/renderer/devtools/devtools_agent.h
+++ b/content/renderer/devtools/devtools_agent.h
@@ -54,6 +54,8 @@ class DevToolsAgent : public RenderViewObserver,
   virtual void saveAgentRuntimeState(const blink::WebString& state) OVERRIDE;
   virtual blink::WebDevToolsAgentClient::WebKitClientMessageLoop*
       createClientMessageLoop() OVERRIDE;
+  virtual void willEnterModalLoop() OVERRIDE;
+  virtual void didExitModalLoop() OVERRIDE;
   virtual void visitAllocatedObjects(AllocatedObjectVisitor* visitor) OVERRIDE;
 
   typedef void (*TraceEventCallback)(
@@ -101,6 +103,7 @@ class DevToolsAgent : public RenderViewObserver,
   bool is_attached_;
   bool is_devtools_client_;
   int32 gpu_route_id_;
+  bool paused_in_mouse_move_;
 
   static base::subtle::AtomicWord /* TraceEventCallback */ event_callback_;