Alternate version of SkLocalMatrixImageFilter using an input.

include/core/SkImageFilter.h

Index: include/core/SkImageFilter.h
diff --git a/include/core/SkImageFilter.h b/include/core/SkImageFilter.h
index 0595010c6fba0321262feca28b887ce3bf272649..0a3f7b8492d6bfd273b4db5e57d9ff903f556d08 100644
--- a/include/core/SkImageFilter.h
+++ b/include/core/SkImageFilter.h
@@ -236,6 +236,13 @@ public:
                                              SkFilterQuality,
                                              SkImageFilter* input = NULL);
 
+    /**
+     * Create an SkLocalMatrixImageFilter, which transform the filter parameters
+     * of its inputs by the given matrix.
+     */
+    static SkImageFilter* CreateLocalMatrixFilter(const SkMatrix& matrix,
+                                                  SkImageFilter* input);
+
 #if SK_SUPPORT_GPU
     /**
      * Wrap the given texture in a texture-backed SkBitmap.