Add ColorCodecSrc for testing/comparison on color corrected decodes

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 190 matching lines @@
     bool veto(SinkFlags) const override;
     bool serial() const override { return fRunSerially; }
 private:
     Path        fPath;
     Mode        fMode;
     SkAlphaType fDstAlphaType;
     bool        fIsGpu;
     bool        fRunSerially;
 };
 
+class ColorCodecSrc : public Src {
+public:
+    enum Mode {
+        // Mimic legacy behavior and apply no color correction.
+        kBaseline_Mode,
+    };
+
+    ColorCodecSrc(Path, Mode);
+
+    Error draw(SkCanvas*) const override;
+    SkISize size() const override;
+    Name name() const override;
+    bool veto(SinkFlags) const override;
+private:
+    Path                    fPath;
+    Mode                    fMode;
+};
+
 class SKPSrc : public Src {
 public:
     explicit SKPSrc(Path path);
 
     Error draw(SkCanvas*) const override;
     SkISize size() const override;
     Name name() const override;
 private:
     Path fPath;
 };
@@ skipping 153 matching lines @@
 
 class ViaMojo : public Via {
 public:
     explicit ViaMojo(Sink* sink) : Via(sink) {}
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
 };
 
 }  // namespace DM
 
 #endif//DMSrcSink_DEFINED