[Android] Use DIP coordinates with MotionEventAndroid

ui/events/gesture_detection/snap_scroll_controller.h

Index: ui/events/gesture_detection/snap_scroll_controller.h
diff --git a/ui/events/gesture_detection/snap_scroll_controller.h b/ui/events/gesture_detection/snap_scroll_controller.h
index ed8717bf698c3c25a2b764e2705e9ba4b2d1d972..753c2bcb20103e383fef3a58d64f20900b6f3d8a 100644
--- a/ui/events/gesture_detection/snap_scroll_controller.h
+++ b/ui/events/gesture_detection/snap_scroll_controller.h
@@ -8,6 +8,10 @@
 #include "base/basictypes.h"
 #include "ui/events/gesture_detection/gesture_detection_export.h"
 
+namespace gfx {
+class Display;
+}
+
 namespace ui {
 
 class MotionEvent;
@@ -17,15 +21,7 @@ class ZoomManager;
 // Controls the scroll snapping behavior based on scroll updates.
 class SnapScrollController {
  public:
-  struct GESTURE_DETECTION_EXPORT Config {
-    Config();
-    ~Config();
-    int screen_width_pixels;
-    int screen_height_pixels;
-    float device_scale_factor;
-  };
-
-  explicit SnapScrollController(const Config& config);
+  explicit SnapScrollController(const gfx::Display& display);
   ~SnapScrollController();
 
   // Updates the snap scroll mode based on the given X and Y distance to be
@@ -49,8 +45,6 @@ class SnapScrollController {
     SNAP_VERT
   };
 
-  static float CalculateChannelDistance(const Config& config);
-
   float channel_distance_;
   SnapMode snap_scroll_mode_;
   float first_touch_x_;