Adopt ui::GestureConfiguration on Android

ui/events/gesture_detection/gesture_configuration.cc

Index: ui/events/gesture_detection/gesture_configuration.cc
diff --git a/ui/events/gesture_detection/gesture_configuration.cc b/ui/events/gesture_detection/gesture_configuration.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cbbbec29d29549239e1bf2dbda347f85d787899b
--- /dev/null
+++ b/ui/events/gesture_detection/gesture_configuration.cc
@@ -0,0 +1,72 @@
+// Copyright (c) 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 "ui/events/gesture_detection/gesture_configuration.h"
+
+namespace ui {
+
+GestureConfiguration::GestureConfiguration()

[tdresser, 2014/10/21 15:21:57]

How many of these parameters are actually set in the same way for Android as for
Aura?
Anything that isn't duplicated, or isn't used in both, should probably be set in
the subclass constructors.

[lanwei, 2014/10/21 20:52:31]

Done.

+    : default_radius_(25),
+      max_distance_for_two_finger_tap_in_pixels_(300),
+      fling_max_cancel_to_down_time_in_ms_(400),
+      fling_max_tap_gap_time_in_ms_(200),
+      long_press_time_in_ms_(1000),
+      semi_long_press_time_in_ms_(400),
+      max_time_between_double_click_in_ms_(700),
+      max_separation_for_gesture_touches_in_pixels_(150),
+      max_swipe_deviation_angle_(20),
+      max_touch_down_duration_for_click_in_ms_(800),
+      max_touch_move_in_pixels_for_click_(15),
+      max_distance_between_taps_for_double_tap_(20),
+      min_distance_for_pinch_scroll_in_pixels_(20),
+      min_pinch_update_distance_in_pixels_(5),
+      min_scroll_velocity_(30.0f),
+      min_swipe_speed_(20),
+
+      // 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),
+      show_press_delay_in_ms_(150),
+      fling_velocity_cap_(17000.0f),
+      tab_scrub_activation_delay_in_ms_(200) {
+// 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
+}
+
+GestureConfiguration::~GestureConfiguration() {
+}
+
+GestureDetector::Config GestureConfiguration::DefaultGestureDetectorConfig() {
+  GestureDetector::Config config;
+  config.longpress_timeout =
+      base::TimeDelta::FromMilliseconds(long_press_time_in_ms());
+  config.showpress_timeout =
+      base::TimeDelta::FromMilliseconds(show_press_delay_in_ms());
+  config.double_tap_timeout =
+      base::TimeDelta::FromMilliseconds(semi_long_press_time_in_ms());
+  config.touch_slop = max_touch_move_in_pixels_for_click();
+  config.double_tap_slop = max_distance_between_taps_for_double_tap();
+  config.minimum_fling_velocity = min_scroll_velocity();
+  config.maximum_fling_velocity = fling_velocity_cap();
+
+  return config;
+}
+
+ScaleGestureDetector::Config
+GestureConfiguration::DefaultScaleGestureDetectorConfig() {
+  ScaleGestureDetector::Config config;
+  config.span_slop = span_slop();
+  config.min_scaling_touch_major = min_scaling_touch_major();
+  config.min_scaling_span = min_scaling_span_in_pixels();
+  config.min_pinch_update_span_delta = min_pinch_update_span_delta();
+  return config;
+}
+
+}  // namespace ui