Give the new font cache GM a name

gm/fontcache.cpp

Index: gm/fontcache.cpp
diff --git a/gm/fontcache.cpp b/gm/fontcache.cpp
index 1e01de0641705706c2fb3eda6e735c4a06317365..ecaa354b61b50b0ea754b1f5facd6cfbb8198bff 100644
--- a/gm/fontcache.cpp
+++ b/gm/fontcache.cpp
@@ -48,7 +48,7 @@ public:
     
 protected:
     virtual SkString onShortName() SK_OVERRIDE {
-        return fName;
+        return SkString("fontcache");
     }
 
     virtual SkISize onISize() SK_OVERRIDE {
@@ -110,7 +110,6 @@ protected:
 
 private:
     SkTypeface* fTypefaces[TYPEFACE_COUNT];
-    SkString fName;
     typedef GM INHERITED;
 };