Start caching masks / stroke fills for textblobs

src/gpu/GrTextBlobCache.cpp

Index: src/gpu/GrTextBlobCache.cpp
diff --git a/src/gpu/GrTextBlobCache.cpp b/src/gpu/GrTextBlobCache.cpp
index a5ef07c9f6c6c22a5d141abc6d8e704b7452219b..fe0ccf609899a15ebeb0238995ca63c1bf245042 100644
--- a/src/gpu/GrTextBlobCache.cpp
+++ b/src/gpu/GrTextBlobCache.cpp
@@ -10,7 +10,7 @@
 static const int kVerticesPerGlyph = 4;
 
 GrTextBlobCache::~GrTextBlobCache() {
-    SkTDynamicHash<BitmapTextBlob, uint32_t>::Iter iter(&fCache);
+    SkTDynamicHash<BitmapTextBlob, BitmapTextBlob::Key>::Iter iter(&fCache);
     while (!iter.done()) {
         (&(*iter))->unref();
         ++iter;