Splits SmoothGestureController from RenderWidgetHostImpl

content/browser/renderer_host/smooth_scroll_gesture_controller.h

+// Copyright (c) 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_SMOOTH_GESTURE_CONTROLLER_H_
+#define CONTENT_BROWSER_RENDERER_HOST_SMOOTH_GESTURE_CONTROLLER_H_
+
+#include <map>
+
+#include "base/memory/weak_ptr.h"
+#include "base/time.h"
+#include "content/common/content_export.h"
+
+struct ViewHostMsg_BeginSmoothScroll_Params;
+
+namespace content {
+
+class RenderWidgetHost;
+class RenderWidgetHostViewPort;
+class SmoothScrollGesture;
+
+// Controls SmoothScrollGestures, used to inject synthetic events
+// for performance test harness.
+class CONTENT_EXPORT SmoothScrollGestureController {
+ public:
+  SmoothScrollGestureController();
+  ~SmoothScrollGestureController();
+
+  // Initiates a synthetic event stream.
+  bool OnBeginSmoothScroll(
+      RenderWidgetHostViewPort* view,
+      const ViewHostMsg_BeginSmoothScroll_Params& params);
+
+  // Called when an input event is going to be forwarded to the renderer.
+  void OnForwardInputEvent();
+
+  // Called when the |rwh| received an ACK for an input event.
+  void OnInputEventACK(RenderWidgetHost* rwh);
+
+  int SyntheticScrollMessageInterval() const;
+
+ private:
+  // Called periodically to advance the active scroll gesture after being
+  // initiated by OnBeginSmoothScroll.
+  void TickActiveSmoothScrollGesture(RenderWidgetHost* rwh);
+
+  base::WeakPtrFactory<SmoothScrollGestureController> weak_factory_;
+
+  int pending_input_event_count_;
+
+  scoped_refptr<SmoothScrollGesture> pending_smooth_scroll_gesture_;
+
+  base::TimeTicks last_smooth_scroll_gesture_tick_time_;
+  bool tick_active_smooth_scroll_gesture_task_posted_;
+
+  DISALLOW_COPY_AND_ASSIGN(SmoothScrollGestureController);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_SMOOTH_GESTURE_CONTROLLER_H_