Initial picture shader implementation

src/core/SkShader.cpp

Index: src/core/SkShader.cpp
diff --git a/src/core/SkShader.cpp b/src/core/SkShader.cpp
index 31b208e2ccdfc609ffc3129fa182333bc83f0af4..e337b7d9063eda8003e8bc00317dd9041fa92bb0 100644
--- a/src/core/SkShader.cpp
+++ b/src/core/SkShader.cpp
@@ -9,6 +9,8 @@
 #include "SkReadBuffer.h"
 #include "SkMallocPixelRef.h"
 #include "SkPaint.h"
+#include "SkPicture.h"
+#include "SkPictureShader.h"
 #include "SkScalar.h"
 #include "SkShader.h"
 #include "SkWriteBuffer.h"
@@ -179,6 +181,10 @@ SkShader* SkShader::CreateBitmapShader(const SkBitmap& src,
     return ::CreateBitmapShader(src, tmx, tmy, NULL);
 }
 
+SkShader* SkShader::CreatePictureShader(SkPicture* src, TileMode tmx, TileMode tmy) {
+    return SkPictureShader::Create(src, tmx, tmy);
+}
+
 #ifndef SK_IGNORE_TO_STRING
 void SkShader::toString(SkString* str) const {
     if (this->hasLocalMatrix()) {