Suppress sending mousedown / mouseup when in fling

content/browser/renderer_host/tap_suppression_controller.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_BROWSER_RENDERER_HOST_TAP_SUPPRESSION_CONTROLLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_TAP_SUPPRESSION_CONTROLLER_H_
 
 #include "base/time.h"
 #include "base/timer.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 
 namespace content {
 
+class MockRenderWidgetHost;
 class RenderWidgetHostImpl;
 
 // Controls the suppression of taps (rapid mousedown/mouseup sequences)
 // immediately following the dispatch of a WebGestureFlingCancel event.
 // Only mousedown/mouseup of sufficient speed and within a specified time
 // window after a WebGestureFlingCancel are suppressed.
 class TapSuppressionController {
  public:
 
   explicit TapSuppressionController(RenderWidgetHostImpl*);
@@ skipping 10 matching lines @@
 
   // Called on an ack of WebGestureFlingCancel event. |processed| is true when
   // the GestureFlingCancel actually stopped a fling and therefore should
   // suppress the forwarding of the following tap.
   void GestureFlingCancelAck(bool processed);
 
   // Called on the dispatch of a WebGestureFlingCancel event.
   void GestureFlingCancel(double cancel_time);
 
  private:
+  friend class MockRenderWidgetHost;
+
    enum State {
      NOTHING,
      GFC_IN_PROGRESS,
      MD_STASHED,
      LAST_CANCEL_STOPPED_FLING,
   };
 
   // Invoked once the maximum time deemed a tap from a mouse down event
   // has expired. If the mouse up has not yet arrived, indicates that the mouse
   // down / mouse up pair do not form a tap.
   void MouseDownTimerExpired();
 
   // Only a RenderWidgetHostViewImpl can own an instance.
   RenderWidgetHostImpl* render_widget_host_;
   base::OneShotTimer<TapSuppressionController> mouse_down_timer_;
   WebKit::WebMouseEvent stashed_mouse_down_;
   State state_;
 
   // TODO(rjkroege): During debugging, the event times did not prove reliable.
   // Replace the use of base::TimeTicks with an accurate event time when they
   // become available post http://crbug.com/119556.
   base::TimeTicks fling_cancel_time_;
 
   DISALLOW_COPY_AND_ASSIGN(TapSuppressionController);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_TAP_SUPPRESSION_CONTROLLER_H_