Pass MotionEvent tilt angles to Blink on Android.

ui/events/blink/blink_event_util.cc

Index: ui/events/blink/blink_event_util.cc
diff --git a/ui/events/blink/blink_event_util.cc b/ui/events/blink/blink_event_util.cc
index b389600f23b33709d46b444a4dcb420368403f6b..d93f02ad17af36cf842157628fe409243ca06938 100644
--- a/ui/events/blink/blink_event_util.cc
+++ b/ui/events/blink/blink_event_util.cc
@@ -106,8 +106,6 @@ WebTouchPoint CreateWebTouchPoint(const MotionEvent& event,
   if (event.GetToolType(pointer_index) == MotionEvent::TOOL_TYPE_STYLUS) {

[mustaq, 2015/06/17 20:01:27]

We should convert MotionEvent orientation+tilt to WebTouchPoint tiltx+tilty
here, see my comment in crrev.com/1192563002.

[USE eero AT chromium.org, 2015/06/18 11:34:07]

Done.

     // Orientation lies in [-180, 180] for a stylus. Normalise to [-90, 90).
     // Allow a small bound tolerance to account for floating point conversion.
-    // TODO(e_hakkinen): crbug.com/493728: Pass also unaltered orientation
-    //                   to touch in order not to lose quadrant information.
     DCHECK_GT(orientation_deg, -180.01f);
     DCHECK_LT(orientation_deg, 180.01f);
     if (orientation_deg >= 90.f)
@@ -137,6 +135,15 @@ WebTouchPoint CreateWebTouchPoint(const MotionEvent& event,
   }
 
   touch.force = event.GetPressure(pointer_index);
+  // TODO(e_hakkinen): Leave only either tilt and tiltOrientation, tiltRad and
+  //                   tiltOrientationRad or tiltX and tiltY.
+  touch.tilt = event.GetTilt(pointer_index) * 180.f / M_PI;
+  touch.tiltRad = event.GetTilt(pointer_index);
+  touch.tiltOrientation =
+      event.GetTiltOrientation(pointer_index) * 180.f / M_PI;
+  touch.tiltOrientationRad = event.GetTiltOrientation(pointer_index);
+  touch.tiltX = event.GetTiltX(pointer_index) * 180.f / M_PI;
+  touch.tiltY = event.GetTiltY(pointer_index) * 180.f / M_PI;
 
   return touch;
 }