Revert of remvoe duplicate impl for SkImageInfo flattening

tests/PictureTest.cpp

Index: tests/PictureTest.cpp
diff --git a/tests/PictureTest.cpp b/tests/PictureTest.cpp
index 3c53dd38381718db159b24c8fff0f639bee14c16..9ef4bb06bdba2551195a1051e6c47bab19220edf 100644
--- a/tests/PictureTest.cpp
+++ b/tests/PictureTest.cpp
@@ -9,7 +9,6 @@
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
 #include "SkData.h"
-#include "SkDecodingImageGenerator.h"
 #include "SkError.h"
 #include "SkPaint.h"
 #include "SkPicture.h"
@@ -336,6 +335,32 @@
 }
 #endif
 
+#include "SkData.h"
+#include "SkImageRef_GlobalPool.h"
+// Class to test SkPixelRef::onRefEncodedData, since there are currently no implementations in skia.
+class SkDataImageRef : public SkImageRef_GlobalPool {
+
+public:
+    SkDataImageRef(SkMemoryStream* stream)
+        : SkImageRef_GlobalPool(stream, SkBitmap::kNo_Config) {
+        SkASSERT(stream != NULL);
+        fData = stream->copyToData();
+        this->setImmutable();
+    }
+
+    ~SkDataImageRef() {
+        fData->unref();
+    }
+
+    virtual SkData* onRefEncodedData() SK_OVERRIDE {
+        fData->ref();
+        return fData;
+    }
+
+private:
+    SkData* fData;
+};
+
 #include "SkImageEncoder.h"
 
 static SkData* encode_bitmap_to_data(size_t* offset, const SkBitmap& bm) {
@@ -377,10 +402,14 @@
         return;
     }
     SkAutoDataUnref data(wStream.copyToData());
-
+    SkMemoryStream memStream;
+    memStream.setData(data);
+
+    // Use the encoded bitmap as the data for an image ref.
     SkBitmap bm;
-    bool installSuccess = SkDecodingImageGenerator::Install(data, &bm);
-    REPORTER_ASSERT(reporter, installSuccess);
+    SkAutoTUnref<SkDataImageRef> imageRef(SkNEW_ARGS(SkDataImageRef, (&memStream)));
+    imageRef->getInfo(&bm);
+    bm.setPixelRef(imageRef);
 
     // Write both bitmaps to pictures, and ensure that the resulting data streams are the same.
     // Flattening original will follow the old path of performing an encode, while flattening bm