add deferred config to DM

dm/DMSrcSink.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 DMSrcSink_DEFINED
 #define DMSrcSink_DEFINED
 
@@ skipping 231 matching lines @@
 public:
     explicit ViaPipe(Sink*);
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
     int enclave() const override { return fSink->enclave(); }
     const char* fileExtension() const override { return fSink->fileExtension(); }
 private:
     SkAutoTDelete<Sink>  fSink;
 };
 
+class ViaDeferred : public Sink {
+public:
+    explicit ViaDeferred(Sink*);
+
+    Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
+    int enclave() const override { return fSink->enclave(); }
+    const char* fileExtension() const override { return fSink->fileExtension(); }
+private:
+    SkAutoTDelete<Sink>  fSink;
+};
+
 class ViaSerialization : public Sink {
 public:
     explicit ViaSerialization(Sink*);
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
     int enclave() const override { return fSink->enclave(); }
     const char* fileExtension() const override { return fSink->fileExtension(); }
 private:
     SkAutoTDelete<Sink> fSink;
 };
@@ skipping 18 matching lines @@
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
     int enclave() const override { return fSink->enclave(); }
     const char* fileExtension() const override { return fSink->fileExtension(); }
 private:
     SkAutoTDelete<Sink>  fSink;
 };
 
 }  // namespace DM
 
 #endif//DMSrcSink_DEFINED