add pipecanvas

include/core/SkStream.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkStream_DEFINED
 #define SkStream_DEFINED
 
@@ skipping 391 matching lines @@
 
     // copy what has been written to the stream into dst
     void copyTo(void* dst) const;
     void writeToStream(SkWStream* dst) const;
 
     /**
      *  Return a copy of the data written so far. This call is responsible for
      *  calling unref() when they are finished with the data.
      */
     SkData* copyToData() const;
+    sk_sp<SkData> makeData() const {
+        return sk_sp<SkData>(this->copyToData());
+    }
 
     /** Reset, returning a reader stream with the current content. */
     SkStreamAsset* detachAsStream();
 
     /** Reset the stream to its original, empty, state. */
     void reset();
     void padToAlign4();
 private:
     struct Block;
     Block*  fHead;
@@ skipping 22 matching lines @@
 
 private:
     size_t fBytesWritten;
     typedef SkWStream INHERITED;
 };
 
 // for now
 typedef SkFILEStream SkURLStream;
 
 #endif