Add color correction benchmark - with comparison to qcms

include/codec/SkCodec.h

Index: include/codec/SkCodec.h
diff --git a/include/codec/SkCodec.h b/include/codec/SkCodec.h
index a2bea14d59a823300e4bce071852c7533588d4d0..2d4402192c915bce647231b5f8166ecc00143f16 100644
--- a/include/codec/SkCodec.h
+++ b/include/codec/SkCodec.h
@@ -26,7 +26,7 @@ class SkSampler;
 namespace DM {
 class ColorCodecSrc;
 }
-
+class ColorCodecBench;
 
 /**
  *  Abstraction layer directly on top of an image codec.
@@ -720,8 +720,9 @@ private:
     virtual SkSampler* getSampler(bool /*createIfNecessary*/) { return nullptr; }
 
     // For testing with qcms
-    // FIXME: Remove this when we are done comparing with qcms.
+    // FIXME: Remove these when we are done comparing with qcms.
     friend class DM::ColorCodecSrc;
+    friend class ColorCodecBench;
 
     friend class SkSampledCodec;
     friend class SkIcoCodec;