Send input event IPCs directly from the UI thread

content/public/browser/render_process_host.h

 // Copyright (c) 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 160 matching lines @@
   // checking if there is connection or not. Virtual for mocking out for tests.
   virtual bool HasConnection() const = 0;
 
   // Call this to allow queueing of IPC messages that are sent before the
   // process is launched.
   virtual void EnableSendQueue() = 0;
 
   // Returns the renderer channel.
   virtual IPC::ChannelProxy* GetChannel() = 0;
 
+  // Returns an IPC::Sender which tries to send messages immediately from the
+  // calling thread. The returned Sender is owned by the RenderProcessHost.
+  virtual IPC::Sender* GetImmediateSender() = 0;
+
+  // Returns an IPC::Sender which always sends messages from the IO thread's
+  // task queue. The returned Sender is owned by the RenderProcessHost.
+  virtual IPC::Sender* GetIOThreadSender() = 0;
+
   // Adds a message filter to the IPC channel.
   virtual void AddFilter(BrowserMessageFilter* filter) = 0;
 
   // Try to shutdown the associated render process as fast as possible
   virtual bool FastShutdownForPageCount(size_t count) = 0;
 
   // TODO(ananta)
   // Revisit whether the virtual functions declared from here on need to be
   // part of the interface.
   virtual void SetIgnoreInputEvents(bool ignore_input_events) = 0;
@@ skipping 167 matching lines @@
   static void SetMaxRendererProcessCount(size_t count);
 
   // Returns the current maximum number of renderer process hosts kept by the
   // content module.
   static size_t GetMaxRendererProcessCount();
 };
 
 }  // namespace content.
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_