experimental/skp_to_pdf_md5 optionally also outputs pdf files

experimental/tools/SkDmuxWStream.h

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SkDmuxWStream_DEFINED
+#define SkDmuxWStream_DEFINED
+
+#include "SkStream.h"
+#include "SkTDArray.h"
+
+/**
+ *  A SkWStream Demultiplexer.  If initialized with
+ *      SkDmuxWStream dmuxWStream(NULL, 0);
+ *  then it becomes a /dev/null.
+ */
+class SkDmuxWStream : public SkWStream {
+public:
+    SkDmuxWStream(SkWStream* const streamArray[], size_t count);
+    ~SkDmuxWStream();
+    virtual bool write(const void* buffer, size_t size) SK_OVERRIDE;
+    virtual void newline() SK_OVERRIDE;
+    virtual void flush() SK_OVERRIDE;
+    virtual size_t bytesWritten() const SK_OVERRIDE;
+
+private:
+    SkTDArray<SkWStream*> fWStreams;
+    size_t fBytesWritten;
+};
+
+#endif  // SkDmuxWStream_DEFINED