Gesture Recognizer: Make short long press time configurable.

ui/base/gestures/gesture_configuration.cc

 // 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.
 
 #include "ui/base/gestures/gesture_configuration.h"
 
 namespace ui {
 
 // Ordered alphabetically ignoring underscores, to align with the
 // associated list of prefs in gesture_prefs_aura.cc.
 int GestureConfiguration::default_radius_ = 15;
 double GestureConfiguration::long_press_time_in_seconds_ = 1.0;
+double GestureConfiguration::semi_long_press_time_in_seconds_ = 0.5;
 double GestureConfiguration::max_distance_for_two_finger_tap_in_pixels_ = 300;
 int GestureConfiguration::max_radius_ = 100;
 double GestureConfiguration::max_seconds_between_double_click_ = 0.7;
 double
   GestureConfiguration::max_separation_for_gesture_touches_in_pixels_ = 150;
 double GestureConfiguration::max_swipe_deviation_ratio_ = 3;
 double
   GestureConfiguration::max_touch_down_duration_in_seconds_for_click_ = 0.8;
 double GestureConfiguration::max_touch_move_in_pixels_for_click_ = 20;
 double GestureConfiguration::min_distance_for_pinch_scroll_in_pixels_ = 20;
 double GestureConfiguration::min_flick_speed_squared_ = 550.f * 550.f;
 double GestureConfiguration::min_pinch_update_distance_in_pixels_ = 5;
 double GestureConfiguration::min_rail_break_velocity_ = 200;
 double GestureConfiguration::min_scroll_delta_squared_ = 5 * 5;
 double GestureConfiguration::min_swipe_speed_ = 20;
 double
   GestureConfiguration::min_touch_down_duration_in_seconds_for_click_ = 0.01;
 
 // The number of points used in the linear regression which determines
 // touch velocity. If fewer than this number of points have been seen,
 // velocity is reported as 0.
 int GestureConfiguration::points_buffered_for_velocity_ = 3;
 double GestureConfiguration::rail_break_proportion_ = 15;
 double GestureConfiguration::rail_start_proportion_ = 2;
 
 }  // namespace ui