Move fling implementation from renderer to browser:

content/browser/renderer_host/input/immediate_input_router.h

Index: content/browser/renderer_host/input/immediate_input_router.h
diff --git a/content/browser/renderer_host/input/immediate_input_router.h b/content/browser/renderer_host/input/immediate_input_router.h
index 0c6a71a6d7cdd97e5d7e185db12536f974a9a040..33254a028ae898e599fcffc7620a067940215a01 100644
--- a/content/browser/renderer_host/input/immediate_input_router.h
+++ b/content/browser/renderer_host/input/immediate_input_router.h
@@ -10,7 +10,8 @@
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
-#include "content/browser/renderer_host/input/gesture_event_filter.h"
+#include "content/browser/renderer_host/input/fling/flinger.h"
+#include "content/browser/renderer_host/input/gesture_event_filter_client.h"
 #include "content/browser/renderer_host/input/input_router.h"
 #include "content/browser/renderer_host/input/touch_event_queue.h"
 #include "content/browser/renderer_host/input/touchpad_tap_suppression_controller.h"
@@ -25,7 +26,7 @@ struct LatencyInfo;
 }
 
 namespace content {
-
+class BaseGestureEventFilter;
 class InputAckHandler;
 class InputRouterClient;
 class OverscrollController;
@@ -37,7 +38,8 @@ class CONTENT_EXPORT ImmediateInputRouter
     : public NON_EXPORTED_BASE(InputRouter),
       public NON_EXPORTED_BASE(GestureEventFilterClient),
       public NON_EXPORTED_BASE(TouchEventQueueClient),
-      public NON_EXPORTED_BASE(TouchpadTapSuppressionControllerClient) {
+      public NON_EXPORTED_BASE(TouchpadTapSuppressionControllerClient),
+      public NON_EXPORTED_BASE(FlingHelper) {
  public:
   ImmediateInputRouter(IPC::Sender* sender,
                        InputRouterClient* client,
@@ -86,6 +88,11 @@ private:
   virtual void OnGestureEventAck(const GestureEventWithLatencyInfo& event,
                                  InputEventAckState ack_result) OVERRIDE;
 
+  // FlingHelper
+  virtual void SendEventForFling(const blink::WebInputEvent& event) OVERRIDE;
+  virtual void FlingFinished(
+      blink::WebGestureEvent::SourceDevice source) OVERRIDE;
+
   bool SendMoveCaret(scoped_ptr<IPC::Message> message);
   bool SendSelectRange(scoped_ptr<IPC::Message> message);
   bool Send(IPC::Message* message);
@@ -176,6 +183,7 @@ private:
 
   int routing_id() const { return routing_id_; }
 
+  BaseGestureEventFilter* gesture_event_filter();
 
   IPC::Sender* sender_;
   InputRouterClient* client_;
@@ -239,7 +247,17 @@ private:
   AckSource current_ack_source_;
 
   scoped_ptr<TouchEventQueue> touch_event_queue_;
-  scoped_ptr<GestureEventFilter> gesture_event_filter_;
+  scoped_ptr<Flinger> flinger_;
+
+  class EventFilteringHelper;
+  scoped_ptr<EventFilteringHelper> event_filter_;
+
+  enum InputMessageSource {
+    MESSAGE_SOURCE_FLING,
+    MESSAGE_SOURCE_REGULAR,
+  };
+
+  std::queue<InputMessageSource> in_process_messages_sources_;
 
   DISALLOW_COPY_AND_ASSIGN(ImmediateInputRouter);
 };