Move gesture/touch UMA logs into gesture provider

ui/events/gesture_detection/gesture_touch_uma_histogram.h

Index: ui/events/gesture_detection/gesture_touch_uma_histogram.h
diff --git a/ui/events/gesture_detection/gesture_touch_uma_histogram.h b/ui/events/gesture_detection/gesture_touch_uma_histogram.h
new file mode 100644
index 0000000000000000000000000000000000000000..58501869bfc3e6e92f4299f4fce27c579469b48e
--- /dev/null
+++ b/ui/events/gesture_detection/gesture_touch_uma_histogram.h
@@ -0,0 +1,95 @@
+// 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_TOUCH_UMA_HISTOGRAM_H_
+#define UI_EVENTS_GESTURE_DETECTION_GESTURE_TOUCH_UMA_HISTOGRAM_H_
+
+#include "base/time/time.h"
+#include "ui/events/event.h"
+#include "ui/events/gesture_detection/gesture_detection_export.h"
+#include "ui/events/gesture_detection/gesture_event_data.h"
+#include "ui/events/gesture_detection/motion_event.h"
+
+namespace ui {
+
+enum UMAEventType {
+  // WARNING: Do not change the numerical values of any of these types.
+  // Do not remove deprecated types - just comment them as deprecated.
+  UMA_ET_UNKNOWN = 0,
+  UMA_ET_TOUCH_RELEASED = 1,
+  UMA_ET_TOUCH_PRESSED = 2,
+  UMA_ET_TOUCH_MOVED = 3,
+  UMA_ET_TOUCH_STATIONARY = 4,  // Deprecated. Do not remove.
+  UMA_ET_TOUCH_CANCELLED = 5,
+  UMA_ET_GESTURE_SCROLL_BEGIN = 6,
+  UMA_ET_GESTURE_SCROLL_END = 7,
+  UMA_ET_GESTURE_SCROLL_UPDATE = 8,
+  UMA_ET_GESTURE_TAP = 9,
+  UMA_ET_GESTURE_TAP_DOWN = 10,
+  UMA_ET_GESTURE_BEGIN = 11,
+  UMA_ET_GESTURE_END = 12,
+  UMA_ET_GESTURE_DOUBLE_TAP = 13,
+  UMA_ET_GESTURE_TRIPLE_TAP = 14,
+  UMA_ET_GESTURE_TWO_FINGER_TAP = 15,
+  UMA_ET_GESTURE_PINCH_BEGIN = 16,
+  UMA_ET_GESTURE_PINCH_END = 17,
+  UMA_ET_GESTURE_PINCH_UPDATE = 18,
+  UMA_ET_GESTURE_LONG_PRESS = 19,
+  UMA_ET_GESTURE_SWIPE_2 = 20,  // Swipe with 2 fingers
+  UMA_ET_SCROLL = 21,
+  UMA_ET_SCROLL_FLING_START = 22,
+  UMA_ET_SCROLL_FLING_CANCEL = 23,
+  UMA_ET_GESTURE_SWIPE_3 = 24,   // Swipe with 3 fingers
+  UMA_ET_GESTURE_SWIPE_4P = 25,  // Swipe with 4+ fingers
+  UMA_ET_GESTURE_SCROLL_UPDATE_2 = 26,
+  UMA_ET_GESTURE_SCROLL_UPDATE_3 = 27,
+  UMA_ET_GESTURE_SCROLL_UPDATE_4P = 28,
+  UMA_ET_GESTURE_PINCH_UPDATE_3 = 29,
+  UMA_ET_GESTURE_PINCH_UPDATE_4P = 30,
+  UMA_ET_GESTURE_LONG_TAP = 31,
+  UMA_ET_GESTURE_SHOW_PRESS = 32,
+  UMA_ET_GESTURE_TAP_CANCEL = 33,
+  UMA_ET_GESTURE_WIN8_EDGE_SWIPE = 34,
+  UMA_ET_GESTURE_SWIPE_1 = 35,  // Swipe with 1 finger
+  // NOTE: Add new event types only immediately above this line. Make sure to
+  // update the UIEventType enum in tools/metrics/histograms/histograms.xml
+  // accordingly.

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

Obey the comment! (Move tap unconfirmed above the comment, and update
histograms.xml)

[lanwei, 2014/08/27 23:32:00]

Done.

+  UMA_ET_GESTURE_TAP_UNCONFIRMED = 36,
+  UMA_ET_COUNT
+};
+
+// Records some touch/gesture event specific details (e.g. what gestures are
+// targetted to which components etc.)
+class GESTURE_DETECTION_EXPORT GestureTouchUMAHistogram {
+ public:
+  GestureTouchUMAHistogram();
+  ~GestureTouchUMAHistogram();
+
+  void RecordGestureEvent(const ui::GestureEventData& gesture);
+  void RecordTouchEvent(const ui::MotionEvent& event);
+
+ private:
+  struct GESTURE_DETECTION_EXPORT WindowTouchDetails {

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

I don't see any reason to put this information in a struct.

We should probably also have either:
is_single_finger_
or some things in scoped ptrs, not both.

[lanwei, 2014/08/27 23:32:00]

Done.

+    WindowTouchDetails();
+    WindowTouchDetails(const base::TimeTicks& start_time,
+                       const gfx::Point& start_touch_position);
+    ~WindowTouchDetails();
+
+    // The first finger's press time
+    base::TimeTicks start_time_;
+    // The first finger's press location
+    gfx::Point start_touch_position_;
+    // The maximum distance the first touch point travelled from its starting
+    // location in pixels.
+    float max_distance_from_start_squared_;
+    bool is_single_finger_;
+  };
+  scoped_ptr<WindowTouchDetails> details;
+  EventType TouchEventTypeFromMotionEvent(const MotionEvent& event);
+  UMAEventType UMAEventTypeFromEvent(const GestureEventData& gesture);
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_GESTURE_DETECTION_GESTURE_TOUCH_UMA_HISTOGRAM_H_