Revert of remvoe duplicate impl for SkImageInfo flattening

src/images/SkImageRef_GlobalPool.cpp

Index: src/images/SkImageRef_GlobalPool.cpp
diff --git a/src/images/SkImageRef_GlobalPool.cpp b/src/images/SkImageRef_GlobalPool.cpp
index f91cebabbf8e7e0c26f06533e35122bc12b62039..352dd42d9f79a3c94dabafff20edbeeb7fdb8b99 100644
--- a/src/images/SkImageRef_GlobalPool.cpp
+++ b/src/images/SkImageRef_GlobalPool.cpp
@@ -24,10 +24,10 @@
     return gPool;
 }
 
-SkImageRef_GlobalPool::SkImageRef_GlobalPool(const SkImageInfo& info,
-                                             SkStreamRewindable* stream,
+SkImageRef_GlobalPool::SkImageRef_GlobalPool(SkStreamRewindable* stream,
+                                             SkBitmap::Config config,
                                              int sampleSize)
-        : SkImageRef(info, stream, sampleSize, &gGlobalPoolMutex) {
+        : SkImageRef(stream, config, sampleSize, &gGlobalPoolMutex) {
     SkASSERT(&gGlobalPoolMutex == this->mutex());
     SkAutoMutexAcquire ac(gGlobalPoolMutex);
     GetGlobalPool()->addToHead(this);