experimentally enable USE_HASH for scaledimagecache

src/core/SkScaledImageCache.cpp

Index: src/core/SkScaledImageCache.cpp
diff --git a/src/core/SkScaledImageCache.cpp b/src/core/SkScaledImageCache.cpp
index e901abdf14e8d5e51f0c0895de63fabf5177b0fe..4afa98fc148df62ce98b08e1a6069d62cfa95382 100644
--- a/src/core/SkScaledImageCache.cpp
+++ b/src/core/SkScaledImageCache.cpp
@@ -150,7 +150,7 @@ class SkScaledImageCache::Hash : public SkTDynamicHash<SkScaledImageCache::Rec,
 ///////////////////////////////////////////////////////////////////////////////
 
 // experimental hash to speed things up
-//#define USE_HASH
+#define USE_HASH
 
 SkScaledImageCache::SkScaledImageCache(size_t byteLimit) {
     fHead = NULL;