Move gesture/touch UMA logs into gesture provider

ui/events/gesture_detection/gesture_provider.h

 // 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.
 
 #ifndef UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_
 #define UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/gesture_detection/gesture_detection_export.h"
 #include "ui/events/gesture_detection/gesture_detector.h"
 #include "ui/events/gesture_detection/gesture_event_data.h"
+#include "ui/events/gesture_detection/gesture_touch_uma_histogram.h"
 #include "ui/events/gesture_detection/scale_gesture_detector.h"
 #include "ui/events/gesture_detection/snap_scroll_controller.h"
 #include "ui/gfx/display.h"
 
 namespace ui {
 
 class GESTURE_DETECTION_EXPORT GestureProviderClient {
  public:
   virtual ~GestureProviderClient() {}
   virtual void OnGestureEvent(const GestureEventData& gesture) = 0;
@@ skipping 71 matching lines @@
   bool CanHandle(const MotionEvent& event) const;
   void OnTouchEventHandlingBegin(const MotionEvent& event);
   void OnTouchEventHandlingEnd(const MotionEvent& event);
   void UpdateDoubleTapDetectionSupport();
 
   class GestureListenerImpl;
   scoped_ptr<GestureListenerImpl> gesture_listener_;
 
   scoped_ptr<MotionEvent> current_down_event_;
 
+  // Create a GestureTouchUMAHistogram object to record some touch and gesture
+  // events

[tdresser, 2014/08/27 12:35:39]

Reword comment (the fact that we're instantiating an object is obvious, only
state what isn't obvious.

Something like:
// Logs information on touch and gesture events.

(Also, add a period at the end.)

[lanwei, 2014/08/27 23:31:59]

Done.

+  GestureTouchUMAHistogram umaHistogram;

[tdresser, 2014/08/27 12:35:38]

"Variable names are all lowercase, with underscores between words. Class member
variables have trailing underscores"

http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml?showone=Variab...

[lanwei, 2014/08/27 23:31:59]

Done.

+
   // Whether double-tap gesture detection is currently supported.
   bool double_tap_support_for_page_;
   bool double_tap_support_for_platform_;
 
   const bool gesture_begin_end_types_enabled_;
 };
 
 }  //  namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_