add pipecanvas

src/core/SkDeduper.h

Index: src/core/SkDeduper.h
diff --git a/src/core/SkDeduper.h b/src/core/SkDeduper.h
new file mode 100644
index 0000000000000000000000000000000000000000..f82f4fd8c268e3cc7c67712d60067c77c5c40023
--- /dev/null
+++ b/src/core/SkDeduper.h
@@ -0,0 +1,39 @@
+/*
+ * 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 SkDeduper_DEFINED
+#define SkDeduper_DEFINED
+
+#include "SkTypes.h"
+
+class SkImage;
+class SkPicture;
+class SkTypeface;
+
+class SkDeduper {
+public:
+    virtual ~SkDeduper() {}
+
+    // These return 0 on failure
+
+    virtual int findOrDefineImage(SkImage*) = 0;
+    virtual int findOrDefinePicture(SkPicture*) = 0;
+    virtual int findOrDefineTypeface(SkTypeface*) = 0;
+    virtual int findOrDefineFactory(SkFlattenable*) = 0;
+};
+
+class SkInflator {
+public:
+    virtual ~SkInflator() {}
+
+    virtual SkImage* getImage(int) = 0;
+    virtual SkPicture* getPicture(int) = 0;
+    virtual SkTypeface* getTypeface(int) = 0;
+    virtual SkFlattenable::Factory getFactory(int) = 0;
+};
+
+#endif