Add SkEncodedFormat, used by SkCodec.

include/codec/SkCodec.h

Index: include/codec/SkCodec.h
diff --git a/include/codec/SkCodec.h b/include/codec/SkCodec.h
index 6d0557cb28d22445c9dd9de1550e8a99eea97e6a..6345c8d475881da4ae7b0c79039b4ab976e3e9dc 100644
--- a/include/codec/SkCodec.h
+++ b/include/codec/SkCodec.h
@@ -8,6 +8,7 @@
 #ifndef SkCodec_DEFINED
 #define SkCodec_DEFINED
 
+#include "SkEncodedFormat.h"
 #include "SkImageGenerator.h"
 #include "SkImageInfo.h"
 #include "SkSize.h"
@@ -50,6 +51,11 @@ public:
         return this->onGetScaledDimensions(desiredScale);
     }
 
+    /**
+     *  Format of the encoded data.
+     */
+    SkEncodedFormat getEncodedFormat() const { return this->onGetEncodedFormat(); }
+
 protected:
     SkCodec(const SkImageInfo&, SkStream*);
 
@@ -71,6 +77,8 @@ protected:
         return fInfo.dimensions();
     }
 
+    virtual SkEncodedFormat onGetEncodedFormat() const = 0;
+
     /**
      *  If the stream was previously read, attempt to rewind.
      *  @returns: