cc: Create a Region class that wraps SkRegion, to replace use of WebCore::Region.

cc/math_util.h

 // Copyright 2012 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 CC_MATH_UTIL_H_
 #define CC_MATH_UTIL_H_
 
 #include "base/logging.h"
 #include "cc/cc_export.h"
 #include "ui/gfx/point_f.h"
@@ skipping 49 matching lines @@
     }
 
     double x;
     double y;
     double z;
     double w;
 };
 
 class CC_EXPORT MathUtil {
 public:
+    static const double PI_DOUBLE;
+    static const float PI_FLOAT;
+
+    static double Deg2Rad(double deg)  { return deg * PI_DOUBLE / 180; }
+    static double Rad2Deg(double rad)  { return rad * 180 / PI_DOUBLE; }
+
+    static float Deg2Rad(float deg)  { return deg * PI_FLOAT / 180; }
+    static float Rad2Deg(float rad)  { return rad * 180 / PI_FLOAT; }
 
     // Background: WebTransformationMatrix code in WebCore does not do the right thing in
     // mapRect / mapQuad / projectQuad when there is a perspective projection that causes
     // one of the transformed vertices to go to w < 0. In those cases, it is necessary to
     // perform clipping in homogeneous coordinates, after applying the transform, before
     // dividing-by-w to convert to cartesian coordinates.
     //
     // These functions return the axis-aligned rect that encloses the correctly clipped,
     // transformed polygon.
     static gfx::Rect mapClippedRect(const WebKit::WebTransformationMatrix&, const gfx::Rect&);
@@ skipping 25 matching lines @@
     // assumed to be normalized.
     static float smallestAngleBetweenVectors(gfx::Vector2dF, gfx::Vector2dF);
 
     // Projects the |source| vector onto |destination|. Neither vector is assumed to be normalized.
     static gfx::Vector2dF projectVector(gfx::Vector2dF source, gfx::Vector2dF destination);
 };
 
 } // namespace cc
 
 #endif  // CC_MATH_UTIL_H_