[android] Remove unused scroll delta in TopControls

cc/input/top_controls_manager.cc

 // 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.
 
 #include "cc/input/top_controls_manager.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "cc/animation/keyframed_animation_curve.h"
@@ skipping 119 matching lines @@
 
   gfx::Vector2dF applied_delta(0.f, old_offset - client_->ControlsTopOffset());
   return pending_delta - applied_delta;
 }
 
 void TopControlsManager::ScrollEnd() {
   DCHECK(!pinch_gesture_active_);
   StartAnimationIfNecessary();
 }
 
+void TopControlsManager::RemoveUnUsedScrollDelta(float unused_delta) {
+  current_scroll_delta_ -= unused_delta;
+}
+
 void TopControlsManager::PinchBegin() {
   DCHECK(!pinch_gesture_active_);
   pinch_gesture_active_ = true;
   StartAnimationIfNecessary();
 }
 
 void TopControlsManager::PinchEnd() {
   DCHECK(pinch_gesture_active_);
   // Pinch{Begin,End} will always occur within the scope of Scroll{Begin,End},
   // so return to a state expected by the remaining scroll sequence.
@@ skipping 97 matching lines @@
 
   if ((animation_direction_ == SHOWING_CONTROLS && new_offset >= 0) ||
       (animation_direction_ == HIDING_CONTROLS
           && new_offset <= -top_controls_height_)) {
     return true;
   }
   return false;
 }
 
 }  // namespace cc