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..db81d902815c1d98b9bcca8ea085b68334d5f847
--- /dev/null
+++ b/ui/events/gesture_detection/gesture_configuration.cc
@@ -0,0 +1,52 @@
+// 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()
+    : default_radius_(25),
+      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),

[jdduke (slow), 2014/10/23 21:02:44]

My only remaining concern is devtools touch emulation on Mac. As it stands, Mac
emulation would now be using these constants (instead of the
GestureDetector::Config defaults, which were taken from Android defaults) for
touch emulation. They're actually quite different for a number of these values
(e.g., long press on Android is 500ms, the double-tap distance is 100 instead of
20, etc...).

Maybe it's not as big an issue as now we have parity on desktop, but it's
something to keep in mind. dgozman@: Thoughts?

+      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),
+      min_scaling_touch_major_(0),
+      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),
+      span_slop_(0),
+      swipe_enabled_(false),
+      tab_scrub_activation_delay_in_ms_(200),
+      two_finger_tap_enabled_(false) {
+}
+
+GestureConfiguration::~GestureConfiguration() {
+}
+
+}  // namespace ui