Convert everything in the Sky API from degrees to radians.

sky/engine/core/painting/CanvasPath.h

 // 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.
 
 #ifndef SKY_ENGINE_CORE_PAINTING_PATH_H_
 #define SKY_ENGINE_CORE_PAINTING_PATH_H_
 
+#include "math.h"
+
 #include "sky/engine/core/painting/Rect.h"
 #include "sky/engine/tonic/dart_wrappable.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 #include "sky/engine/wtf/RefCounted.h"
 #include "third_party/skia/include/core/SkPath.h"
 
 // Note: There's a very similar class in ../../platform/graphics/Path.h
 // We should probably rationalise these two.
 // (The existence of that class is why this is CanvasPath and not just Path.)
 
@@ skipping 13 matching lines @@
         m_path.moveTo(x, y);
     }
 
     void lineTo(float x, float y)
     {
         m_path.lineTo(x, y);
     }
 
     void arcTo(const Rect& rect, float startAngle, float sweepAngle, bool forceMoveTo)
     {
-        m_path.arcTo(rect.sk_rect, startAngle, sweepAngle, forceMoveTo);
+        m_path.arcTo(rect.sk_rect, startAngle*180.0/M_PI, sweepAngle*180.0/M_PI, forceMoveTo);
     }
 
     void close()
     {
         m_path.close();
     }
 
     const SkPath& path() const { return m_path; }
 
 private:
     CanvasPath();
 
     SkPath m_path;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_PAINTING_PATH_H_