add pipecanvas

src/core/SkPipe.h

Index: src/core/SkPipe.h
diff --git a/src/core/SkPipe.h b/src/core/SkPipe.h
new file mode 100644
index 0000000000000000000000000000000000000000..56fe9757c12bac042f1464219e8629e76b98053d
--- /dev/null
+++ b/src/core/SkPipe.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPipe_DEFINED
+#define SkPipe_DEFINED
+
+#include "SkTypes.h"
+
+class SkCanvas;
+class SkImage;
+class SkPicture;
+class SkWStream;
+
+class SkPipeSerializer {
+public:
+    SkPipeSerializer();
+    ~SkPipeSerializer();
+
+    void reset();
+
+    void write(SkPicture*, SkWStream*);
+    void write(SkImage*, SkWStream*);
+
+    SkCanvas* beginWrite(const SkRect& cullBounds, SkWStream*);
+    void endWrite();
+
+private:
+    class Impl;
+    Impl* fImpl;
+};
+
+class SkPipeDeserializer {
+public:
+    SkPipeDeserializer();
+    ~SkPipeDeserializer();
+
+    sk_sp<SkPicture> readPicture(const void*, size_t);
+    sk_sp<SkImage> readImage(const void*, size_t);
+    bool playback(const void*, size_t, SkCanvas*);
+
+private:
+    class Impl;
+    Impl* fImpl;
+};
+
+#endif