HTML5 Canvas should avoid converting rotation angle to degrees

Source/platform/graphics/Path.cpp

 /*
  * Copyright (C) 2003, 2006 Apple Computer, Inc.  All rights reserved.
  *                     2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 354 matching lines @@
     ASSERT(ellipseIsRenderable(startAngle, endAngle));
     ASSERT(startAngle >= 0 && startAngle < twoPiFloat);
     ASSERT((anticlockwise && (startAngle - endAngle) >= 0) || (!anticlockwise && (endAngle - startAngle) >= 0));
 
     if (!rotation) {
         addEllipse(FloatPoint(p.x(), p.y()), radiusX, radiusY, startAngle, endAngle, anticlockwise);
         return;
     }
 
     // Add an arc after the relevant transform.
-    AffineTransform ellipseTransform = AffineTransform::translation(p.x(), p.y()).rotate(rad2deg(rotation));
+    AffineTransform ellipseTransform = AffineTransform::translation(p.x(), p.y()).rotateRadians(rotation);
     ASSERT(ellipseTransform.isInvertible());
     AffineTransform inverseEllipseTransform = ellipseTransform.inverse();
     transform(inverseEllipseTransform);
     addEllipse(FloatPoint::zero(), radiusX, radiusY, startAngle, endAngle, anticlockwise);
     transform(ellipseTransform);
 }
 
 void Path::addEllipse(const FloatRect& rect)
 {
     m_path.addOval(rect);
@@ skipping 103 matching lines @@
 
 #if !ASSERT_DISABLED
 bool ellipseIsRenderable(float startAngle, float endAngle)
 {
     return (std::abs(endAngle - startAngle) < twoPiFloat)
         || WebCoreFloatNearlyEqual(std::abs(endAngle - startAngle), twoPiFloat);
 }
 #endif
 
 }