Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/gesture_detection/gesture_configuration.cc

+// Copyright 2014 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/events/gesture_detection/gesture_configuration.h"
+
+namespace ui {
+namespace {
+
+GestureConfiguration* instance = nullptr;
+
+}  // namespace
+
+// static
+void GestureConfiguration::SetInstance(GestureConfiguration* config) {
+  instance = config;
+}
+
+// static
+GestureConfiguration* GestureConfiguration::GetInstance() {
+  if (instance)
+    return instance;
+
+  return GestureConfiguration::GetPlatformSpecificInstance();
+}
+
+GestureConfiguration::GestureConfiguration()
+    : default_radius_(25),
+      double_tap_enabled_(false),
+      double_tap_timeout_in_ms_(400),
+      fling_max_cancel_to_down_time_in_ms_(400),
+      fling_max_tap_gap_time_in_ms_(200),
+      gesture_begin_end_types_enabled_(false),
+      long_press_time_in_ms_(1000),
+      max_distance_between_taps_for_double_tap_(20),
+      max_distance_for_two_finger_tap_in_pixels_(300),
+      max_fling_velocity_(17000.0f),
+      max_gesture_bounds_length_(0),
+      max_separation_for_gesture_touches_in_pixels_(150),
+      max_swipe_deviation_angle_(20),
+      max_time_between_double_click_in_ms_(700),
+      max_touch_down_duration_for_click_in_ms_(800),
+      max_touch_move_in_pixels_for_click_(15),
+      min_distance_for_pinch_scroll_in_pixels_(20),
+      min_fling_velocity_(30.0f),
+      min_gesture_bounds_length_(0),
+      min_pinch_update_span_delta_(0),
+      // If this is too small, we currently can get single finger pinch zoom.
+      // See crbug.com/357237 for details.
+      min_scaling_span_in_pixels_(125),
+      // The default value of min_scaling_touch_major_ is 2 * default_radius_.
+      min_scaling_touch_major_(50),
+      min_swipe_velocity_(20),
+      // TODO(jdduke): Disable and remove entirely when issues with intermittent
+      // scroll end detection on the Pixel are resolved, crbug.com/353702.
+#if defined(OS_CHROMEOS)
+      scroll_debounce_interval_in_ms_(30),
+#else
+      scroll_debounce_interval_in_ms_(0),
+#endif
+      semi_long_press_time_in_ms_(400),
+      show_press_delay_in_ms_(150),
+      // The default value of span_slop_ is
+      // 2 * max_touch_move_in_pixels_for_click_.
+      span_slop_(30),
+      swipe_enabled_(false),
+      tab_scrub_activation_delay_in_ms_(200),
+      two_finger_tap_enabled_(false),
+      velocity_tracker_strategy_(VelocityTracker::Strategy::STRATEGY_DEFAULT) {
+}
+
+GestureConfiguration::~GestureConfiguration() {
+}
+
+}  // namespace ui