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

ui/events/gesture_detection/gesture_configuration_aura.cc

Index: ui/events/gesture_detection/gesture_configuration_aura.cc
diff --git a/ui/events/gesture_detection/gesture_configuration_aura.cc b/ui/events/gesture_detection/gesture_configuration_aura.cc
new file mode 100644
index 0000000000000000000000000000000000000000..df4bcf471ac6819dcf6abce11565472647257631
--- /dev/null
+++ b/ui/events/gesture_detection/gesture_configuration_aura.cc
@@ -0,0 +1,52 @@
+// 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"
+
+#include "base/command_line.h"
+#include "base/memory/singleton.h"
+#include "ui/events/event_switches.h"
+
+namespace ui {
+namespace {
+
+class GestureConfigurationAura : public GestureConfiguration {
+ public:
+  ~GestureConfigurationAura() override {
+  }
+
+  static GestureConfigurationAura* GetInstance() {
+    return Singleton<GestureConfigurationAura>::get();
+  }
+
+ private:
+  GestureConfigurationAura() : GestureConfiguration() {
+    set_double_tap_enabled(false);
+    set_double_tap_timeout_in_ms(semi_long_press_time_in_ms());
+    set_gesture_begin_end_types_enabled(true);
+    set_min_gesture_bounds_length(default_radius());
+    set_min_pinch_update_span_delta(
+        base::CommandLine::ForCurrentProcess()->HasSwitch(
+            switches::kCompensateForUnstablePinchZoom)
+            ? 5
+            : 0);
+    set_min_scaling_touch_major(default_radius() * 2);
+    set_velocity_tracker_strategy(VelocityTracker::Strategy::LSQ2_RESTRICTED);
+    set_span_slop(max_touch_move_in_pixels_for_click() * 2);
+    set_swipe_enabled(true);
+    set_two_finger_tap_enabled(true);
+  }
+
+  friend struct DefaultSingletonTraits<GestureConfigurationAura>;
+  DISALLOW_COPY_AND_ASSIGN(GestureConfigurationAura);
+};
+
+}  // namespace
+
+// Create a GestureConfigurationAura singleton instance when using aura.
+GestureConfiguration* GestureConfiguration::GetPlatformSpecificInstance() {
+  return GestureConfigurationAura::GetInstance();
+}
+
+}  // namespace ui