Expose double-tap platform support via ui::GestureConfiguration

ui/events/gesture_detection/gesture_provider_config_helper.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_provider_config_helper.h"
 
 #include "ui/events/gesture_detection/gesture_configuration.h"
 #include "ui/gfx/screen.h"
 
 namespace ui {
@@ skipping 44 matching lines @@
       gesture_config.min_pinch_update_span_delta();
   return config;
 }
 
 GestureProvider::Config BuildGestureProviderConfig(
     const GestureConfiguration& gesture_config) {
   GestureProvider::Config config;
   config.gesture_detector_config = BuildGestureDetectorConfig(gesture_config);
   config.scale_gesture_detector_config =
       BuildScaleGestureDetectorConfig(gesture_config);
+  config.double_tap_support_for_platform_enabled =
+      gesture_config.double_tap_enabled();
   config.gesture_begin_end_types_enabled =
       gesture_config.gesture_begin_end_types_enabled();
   config.min_gesture_bounds_length = gesture_config.min_gesture_bounds_length();
   config.max_gesture_bounds_length = gesture_config.max_gesture_bounds_length();
   return config;
 }
 
 }  // namespace
 
 GestureProvider::Config GetGestureProviderConfig(
@@ skipping 13 matching lines @@
 
   gfx::Screen* screen = gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
   // |screen| is sometimes NULL during tests.
   if (screen)
     config.display = screen->GetPrimaryDisplay();
 
   return config;
 }
 
 }  // namespace ui