[exp] Browser-side fling.

content/browser/renderer_host/input/input_router_impl.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_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_
 
 #include <queue>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/gesture_event_queue.h"
 #include "content/browser/renderer_host/input/input_router.h"
 #include "content/browser/renderer_host/input/touch_action_filter.h"
 #include "content/browser/renderer_host/input/touch_event_queue.h"
 #include "content/browser/renderer_host/input/touchpad_tap_suppression_controller.h"
 #include "content/common/input/input_event_stream_validator.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 
 struct InputHostMsg_HandleInputEvent_ACK_Params;
 
+#if defined(OS_ANDROID)
+namespace gfx {
+class Scroller;
+}
+#endif
+
 namespace IPC {
 class Sender;
 }
 
 namespace ui {
+class FlingCurve;
 struct LatencyInfo;
 }
 
 namespace content {
 
+class Flinger {
+ public:
+  explicit Flinger(const blink::WebGestureEvent& fling_event);
+  virtual ~Flinger();
+
+  blink::WebGestureEvent GetNextScrollEvent();
+
+ private:
+  blink::WebGestureEvent fling_event_;
+#if defined(OS_ANDROID)
+  scoped_ptr<gfx::Scroller> scroller_;
+#else
+  scoped_ptr<ui::FlingCurve> fling_curve_;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(Flinger);
+};
+
 class InputAckHandler;
 class InputRouterClient;
 class OverscrollController;
 struct DidOverscrollParams;
 
 // A default implementation for browser input event routing.
 class CONTENT_EXPORT InputRouterImpl
     : public NON_EXPORTED_BASE(InputRouter),
       public NON_EXPORTED_BASE(GestureEventQueueClient),
       public NON_EXPORTED_BASE(TouchEventQueueClient),
@@ skipping 226 matching lines @@
   // Whether a call to |Flush()| has yet been accompanied by a |DidFlush()| call
   // to the client_ after all events have been dispatched/acked.
   bool flush_requested_;
 
   TouchEventQueue touch_event_queue_;
   GestureEventQueue gesture_event_queue_;
   TouchActionFilter touch_action_filter_;
   InputEventStreamValidator input_stream_validator_;
   InputEventStreamValidator output_stream_validator_;
 
+  scoped_ptr<Flinger> flinger_;
+
   DISALLOW_COPY_AND_ASSIGN(InputRouterImpl);
 };
 
 }  // namespace content
 
 #endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_