fix for atlas is abandoned text corruption

src/gpu/GrBatchFontCache.cpp

Index: src/gpu/GrBatchFontCache.cpp
diff --git a/src/gpu/GrBatchFontCache.cpp b/src/gpu/GrBatchFontCache.cpp
index a1f87cb6b3d672e9790b22c3a4bddbc1120034dd..2d6213c085175414adbb861a40d6c90b80d3f301 100644
--- a/src/gpu/GrBatchFontCache.cpp
+++ b/src/gpu/GrBatchFontCache.cpp
@@ -75,6 +75,7 @@ GrBatchFontCache::GrBatchFontCache(GrContext* context)
 GrBatchFontCache::~GrBatchFontCache() {
     SkTDynamicHash<GrBatchTextStrike, GrFontDescKey>::Iter iter(&fCache);
     while (!iter.done()) {
+        (*iter).fIsAbandoned = true;
         (*iter).unref();
         ++iter;
     }
@@ -86,6 +87,7 @@ GrBatchFontCache::~GrBatchFontCache() {
 void GrBatchFontCache::freeAll() {
     SkTDynamicHash<GrBatchTextStrike, GrFontDescKey>::Iter iter(&fCache);
     while (!iter.done()) {
+        (*iter).fIsAbandoned = true;
         (*iter).unref();
         ++iter;
     }