Speed up GrResourceCache add and lookup by using TDynamicHash

src/core/SkPictureFlat.h

Index: src/core/SkPictureFlat.h
diff --git a/src/core/SkPictureFlat.h b/src/core/SkPictureFlat.h
index ac8e304c0f2c3031885efb09e47d5a6fe00d4913..bda71e2259873d8f9e3664fd460df1b87d575e33 100644
--- a/src/core/SkPictureFlat.h
+++ b/src/core/SkPictureFlat.h
@@ -425,7 +425,7 @@ public:
         fIndexedData[flat->index()] = flat;
 
         // findAndReturnMutableFlat already called fHash.add(), so we just clean up the old entry.
-        fHash.remove(*found);
+        fHash.remove(found);
         fController->unalloc((void*)found);
         SkASSERT(this->count() == oldCount);