[Android] Support double-tap selection

ui/events/gesture_detection/gesture_configuration_android.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"
 
 #include "base/memory/singleton.h"
 #include "ui/gfx/android/view_configuration.h"
 #include "ui/gfx/screen.h"
 
@@ skipping 19 matching lines @@
   }
 
  private:
   GestureConfigurationAndroid() : GestureConfiguration() {
     set_double_tap_enabled(true);
     set_double_tap_timeout_in_ms(ViewConfiguration::GetDoubleTapTimeoutInMs());
     set_gesture_begin_end_types_enabled(false);
     set_long_press_time_in_ms(ViewConfiguration::GetLongPressTimeoutInMs());
     set_max_distance_between_taps_for_double_tap(
         ViewConfiguration::GetDoubleTapSlopInDips());
+    set_max_tap_count(2);
     set_max_fling_velocity(
         ViewConfiguration::GetMaximumFlingVelocityInDipsPerSecond());
     set_max_gesture_bounds_length(kMaxGestureBoundsLengthDips);
     set_max_touch_move_in_pixels_for_click(
         ViewConfiguration::GetTouchSlopInDips());
     set_min_fling_velocity(
         ViewConfiguration::GetMinimumFlingVelocityInDipsPerSecond());
     set_min_gesture_bounds_length(kMinGestureBoundsLengthDips);
     set_min_pinch_update_span_delta(0.f);
     set_min_scaling_span_in_pixels(
@@ skipping 15 matching lines @@
 };
 
 }  // namespace
 
 // Create a GestureConfigurationAura singleton instance when using Android.
 GestureConfiguration* GestureConfiguration::GetPlatformSpecificInstance() {
   return GestureConfigurationAndroid::GetInstance();
 }
 
 }  // namespace ui