Revert of remvoe duplicate impl for SkImageInfo flattening

include/images/SkImageRef.h

Index: include/images/SkImageRef.h
diff --git a/include/images/SkImageRef.h b/include/images/SkImageRef.h
index 36f95e64b2410f1fe2909ff015f3b3d2ff572cc9..0599a8d9633dfe8a7284801b49b5d3efc78a8b9b 100644
--- a/include/images/SkImageRef.h
+++ b/include/images/SkImageRef.h
@@ -34,7 +34,7 @@
         @param config The preferred config of the decoded bitmap.
         @param sampleSize Requested sampleSize for decoding. Defaults to 1.
     */
-    SkImageRef(const SkImageInfo&, SkStreamRewindable*, int sampleSize = 1,
+    SkImageRef(SkStreamRewindable*, SkBitmap::Config config, int sampleSize = 1,
                SkBaseMutex* mutex = NULL);
     virtual ~SkImageRef();
 
@@ -72,9 +72,9 @@
         When these are called, we will have already acquired the mutex!
      */
 
-    virtual bool onNewLockPixels(LockRec*) SK_OVERRIDE;
+    virtual void* onLockPixels(SkColorTable**);
     // override this in your subclass to clean up when we're unlocking pixels
-    virtual void onUnlockPixels() SK_OVERRIDE {}
+    virtual void onUnlockPixels() {}
 
     SkImageRef(SkFlattenableReadBuffer&, SkBaseMutex* mutex = NULL);
     virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
@@ -89,6 +89,7 @@
 
     SkImageDecoderFactory*  fFactory;    // may be null
     SkStreamRewindable*     fStream;
+    SkBitmap::Config        fConfig;
     int                     fSampleSize;
     bool                    fDoDither;
     bool                    fErrorInDecoding;