Add rotation APIs in radians to SkCanvas, SkMatrix

include/core/SkMatrix.h

Index: include/core/SkMatrix.h
diff --git a/include/core/SkMatrix.h b/include/core/SkMatrix.h
index 9bbbc1745b3d64118125a08af39c2be28040b6de..1e27fb3c0aedf987c9980cd9de5b2523556d02b2 100644
--- a/include/core/SkMatrix.h
+++ b/include/core/SkMatrix.h
@@ -201,6 +201,14 @@ public:
     /** Set the matrix to rotate about (0,0) by the specified number of degrees.
     */
     void setRotate(SkScalar degrees);
+    /** Set the matrix to rotate by the specified number of radians, with a
+        pivot point at (px, py). The pivot point is the coordinate that should
+        remain unchanged by the specified transformation.
+    */
+    void setRotateRadians(SkScalar radians, SkScalar px, SkScalar py);
+    /** Set the matrix to rotate about (0,0) by the specified number of radians.
+    */
+    void setRotateRadians(SkScalar radians);
     /** Set the matrix to rotate by the specified sine and cosine values, with
         a pivot point at (px, py). The pivot point is the coordinate that
         should remain unchanged by the specified transformation.
@@ -244,6 +252,14 @@ public:
         M' = M * R(degrees)
     */
     bool preRotate(SkScalar degrees);
+    /** Preconcats the matrix with the specified rotation.
+        M' = M * R(radians, px, py)
+    */
+    bool preRotateRadians(SkScalar degrees, SkScalar px, SkScalar py);
+    /** Preconcats the matrix with the specified rotation.
+        M' = M * R(radians)
+    */
+    bool preRotateRadians(SkScalar degrees);
     /** Preconcats the matrix with the specified skew.
         M' = M * K(kx, ky, px, py)
     */
@@ -281,6 +297,14 @@ public:
         M' = R(degrees) * M
     */
     bool postRotate(SkScalar degrees);
+    /** Postconcats the matrix with the specified rotation.
+        M' = R(radians, px, py) * M
+    */
+    bool postRotateRadians(SkScalar degrees, SkScalar px, SkScalar py);
+    /** Postconcats the matrix with the specified rotation.
+        M' = R(radians) * M
+    */
+    bool postRotateRadians(SkScalar degrees);
     /** Postconcats the matrix with the specified skew.
         M' = K(kx, ky, px, py) * M
     */