Handle touchpad flings with passive event listeners on compositor thread.

content/renderer/input/input_handler_manager_client.h

 // Copyright 2013 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_RENDERER_INPUT_INPUT_HANDLER_MANAGER_CLIENT_H_
 #define CONTENT_RENDERER_INPUT_INPUT_HANDLER_MANAGER_CLIENT_H_
 
 #include "base/callback.h"
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "content/common/content_export.h"
 #include "content/common/input/input_event_ack_state.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
+#include "ui/events/blink/scoped_web_input_event.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace cc {
 class InputHandler;
 }
 
 namespace ui {
 class SynchronousInputHandlerProxy;
 struct DidOverscrollParams;
 }
@@ skipping 16 matching lines @@
   virtual void RegisterRoutingID(int routing_id) = 0;
   virtual void UnregisterRoutingID(int routing_id) = 0;
 
   // |HandleInputEvent| will respond to overscroll by calling the passed in
   // callback.
   // Otherwise |DidOverscroll| will be fired.
   virtual void DidOverscroll(int routing_id,
                              const ui::DidOverscrollParams& params) = 0;
   virtual void DidStartFlinging(int routing_id) = 0;
   virtual void DidStopFlinging(int routing_id) = 0;
+  virtual void DispatchNonBlockingEventToMainThread(
+      int routing_id,
+      ui::ScopedWebInputEvent event) = 0;
 
  protected:
   InputHandlerManagerClient() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InputHandlerManagerClient);
 };
 
 class CONTENT_EXPORT SynchronousInputHandlerProxyClient {
  public:
   virtual ~SynchronousInputHandlerProxyClient() {}
 
   virtual void DidAddSynchronousHandlerProxy(
       int routing_id,
       ui::SynchronousInputHandlerProxy* synchronous_handler) = 0;
   virtual void DidRemoveSynchronousHandlerProxy(int routing_id) = 0;
 
  protected:
   SynchronousInputHandlerProxyClient() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SynchronousInputHandlerProxyClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_INPUT_INPUT_HANDLER_MANAGER_CLIENT_H_