Convert everything in the Sky API from degrees to radians.

sky/engine/core/painting/Canvas.cpp

 // 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.
 
+#include "math.h"
+
 #include "sky/engine/config.h"
 #include "sky/engine/core/painting/Canvas.h"
 
 #include "sky/engine/core/dom/Document.h"
 #include "sky/engine/core/dom/Element.h"
 #include "sky/engine/core/painting/CanvasImage.h"
 #include "sky/engine/core/painting/PaintingTasks.h"
 #include "sky/engine/platform/geometry/IntRect.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 45 matching lines @@
 }
 
 void Canvas::scale(float sx, float sy)
 {
     if (!m_canvas)
         return;
     ASSERT(m_displayList->isRecording());
     m_canvas->scale(sx, sy);
 }
 
-void Canvas::rotateDegrees(float degrees)
+void Canvas::rotate(float radians)
 {
     if (!m_canvas)
         return;
     ASSERT(m_displayList->isRecording());
-    m_canvas->rotate(degrees);
+    m_canvas->rotate(radians * 180.0/M_PI);
 }
 
 void Canvas::skew(float sx, float sy)
 {
     if (!m_canvas)
         return;
     ASSERT(m_displayList->isRecording());
     m_canvas->skew(sx, sy);
 }
 
@@ skipping 117 matching lines @@
 PassRefPtr<DisplayList> Canvas::finishRecording()
 {
     if (!isRecording())
         return nullptr;
     m_canvas = nullptr;
     m_displayList->endRecording();
     return m_displayList.release();
 }
 
 } // namespace blink