Suppress LongPress/Tap, and TwoFingerTap when TapDown cancels a fling.

content/browser/renderer_host/input/tap_suppression_controller.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_TAP_SUPPRESSION_CONTROLLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_TAP_SUPPRESSION_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
@@ skipping 52 matching lines @@
 
  private:
   friend class MockTapSuppressionController;
 
   enum State {
     DISABLED,
     NOTHING,
     GFC_IN_PROGRESS,
     TAP_DOWN_STASHED,
     LAST_CANCEL_STOPPED_FLING,
+    // When the stashed TapDown event is dropped or forwarded due to tap down
+    // timer expiration, the contorller enters the SUPPRESSING_TAPS state.

[tdresser, 2016/12/07 19:53:21]

controller

[sahel, 2016/12/09 16:49:12]

Done.

+    // This state shows that the controller will suppress LongTap,
+    // TwoFingerTap, and TapCancel gesture events untill the next tapDown event

[tdresser, 2016/12/07 19:53:21]

until

[sahel, 2016/12/09 16:49:12]

Done.

+    // arrives.
+    SUPPRESSING_TAPS,
   };
 
   TapSuppressionControllerClient* client_;
   base::OneShotTimer tap_down_timer_;
   State state_;
 
   base::TimeDelta max_cancel_to_down_time_;
   base::TimeDelta max_tap_gap_time_;
 
   // 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_INPUT_TAP_SUPPRESSION_CONTROLLER_H_