Add tangentialPressure and twist properties to PointerEvent on Mac

content/browser/renderer_host/input/web_input_event_builders_mac.mm

 // Copyright 2015 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.
 
 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006-2009 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 326 matching lines @@
 
   // Set stylus properties for events with a subtype of
   // NSTabletPointEventSubtype.
   result.pointerType = blink::WebPointerProperties::PointerType::Pen;
   result.id = [event deviceID];
   if (subtype == NSTabletPointEventSubtype) {
     result.force = [event pressure];
     NSPoint tilt = [event tilt];
     result.tiltX = lround(tilt.x * 90);
     result.tiltY = lround(tilt.y * 90);
+    result.tangentialPressure = [event tangentialPressure];
+    // NSEvent spec doesn't specify the range of rotation, we make sure that
+    // this value is in the range of [0,359].
+    int twist = (int)[event rotation];
+    twist = twist % 360;
+    if (twist < 0)
+      twist += 360;
+    result.twist = twist;
   }
   return result;
 }
 
 // WebMouseWheelEvent ---------------------------------------------------------
 
 blink::WebMouseWheelEvent WebMouseWheelEventBuilder::Build(
     NSEvent* event,
     NSView* view) {
   blink::WebMouseWheelEvent result(blink::WebInputEvent::MouseWheel,
@@ skipping 176 matching lines @@
       // to specify them when the gesture is differentiated.
       break;
     default:
       NOTIMPLEMENTED();
   }
 
   return result;
 }
 
 }  // namespace content