Avoid UTF-8 conversions and string copies whenever possible.

Change-Id: Ie4584417bbb7247e6c567fbfdb819529e548bb8f
diff --git a/libs/hwui/TextDropShadowCache.cpp b/libs/hwui/TextDropShadowCache.cpp
index 3256790..8f6f860 100644
--- a/libs/hwui/TextDropShadowCache.cpp
+++ b/libs/hwui/TextDropShadowCache.cpp
@@ -147,6 +147,9 @@
             if (mDebugEnabled) {
                 LOGD("Shadow texture created, size = %d", texture->bitmapSize);
             }
+
+            entry.copyTextLocally();
+
             mSize += size;
             mCache.put(entry, texture);
         } else {