[Android] Use DIP coordinates with MotionEventAndroid

ui/events/gesture_detection/scale_gesture_detector.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_SCALE_GESTURE_DETECTOR_H_
 #define UI_EVENTS_GESTURE_DETECTION_SCALE_GESTURE_DETECTOR_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "ui/events/gesture_detection/gesture_detection_export.h"
 #include "ui/events/gesture_detection/gesture_detector.h"
 
 namespace ui {
 
 class MotionEvent;
 
 // Port of ScaleGestureDetector.java from Android
 // * platform/frameworks/base/core/java/android/view/ScaleGestureDetector.java
 // * Change-Id: I3e7926a4f6f9ab4951f380bd004499c78b3bda69
 // * Please update the Change-Id as upstream Android changes are pulled.
 class ScaleGestureDetector : public GestureDetector::SimpleGestureListener {
  public:
   struct GESTURE_DETECTION_EXPORT Config {
     Config();
     ~Config();
     GestureDetector::Config gesture_detector_config;
+
+    // Minimum accepted value for TouchMajor while scaling (in dips).
+    float min_scaling_touch_major;
+
+    // Minimum span needed to initiate a scaling gesture (in dips).
+    float min_scaling_span;
+
+    // Whether double-tap drag scaling is enabled.
     bool quick_scale_enabled;
-    int min_scaling_touch_major;
-    int min_scaling_span;
   };
 
   class ScaleGestureListener {
    public:
     virtual ~ScaleGestureListener() {}
     virtual bool OnScale(const ScaleGestureDetector& detector,
                          const MotionEvent& e) = 0;
     virtual bool OnScaleBegin(const ScaleGestureDetector& detector,
                               const MotionEvent& e) = 0;
     virtual void OnScaleEnd(const ScaleGestureDetector& detector,
@@ skipping 73 matching lines @@
   float curr_span_;
   float prev_span_;
   float initial_span_;
   float curr_span_x_;
   float curr_span_y_;
   float prev_span_x_;
   float prev_span_y_;
   base::TimeTicks curr_time_;
   base::TimeTicks prev_time_;
   bool in_progress_;
-  int span_slop_;
-  int min_span_;
+  float span_slop_;
+  float min_span_;
 
   // Bounds for recently seen values.
   float touch_upper_;
   float touch_lower_;
   float touch_history_last_accepted_;
   int touch_history_direction_;
   base::TimeTicks touch_history_last_accepted_time_;
-  int touch_min_major_;
+  float touch_min_major_;
   float double_tap_focus_x_;
   float double_tap_focus_y_;
   DoubleTapMode double_tap_mode_;
 
   bool event_before_or_above_starting_gesture_event_;
 
   scoped_ptr<GestureDetector> gesture_detector_;
 
   DISALLOW_COPY_AND_ASSIGN(ScaleGestureDetector);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_SCALE_GESTURE_DETECTOR_H_