[Android] Use DIP coordinates with MotionEventAndroid

ui/events/gesture_detection/scale_gesture_detector.h

Index: ui/events/gesture_detection/scale_gesture_detector.h
diff --git a/ui/events/gesture_detection/scale_gesture_detector.h b/ui/events/gesture_detection/scale_gesture_detector.h
index 2d83ca10e71c6b313568455a3be2f438111ee70b..08b62887c3a05ab137587ac2bc0cdf2cd8a975f8 100644
--- a/ui/events/gesture_detection/scale_gesture_detector.h
+++ b/ui/events/gesture_detection/scale_gesture_detector.h
@@ -24,9 +24,15 @@ class ScaleGestureDetector : public GestureDetector::SimpleGestureListener {
     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 {
@@ -120,8 +126,8 @@ class ScaleGestureDetector : public GestureDetector::SimpleGestureListener {
   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_;
@@ -129,7 +135,7 @@ class ScaleGestureDetector : public GestureDetector::SimpleGestureListener {
   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_;