Correctly blend translucent GIF bitmaps.

Change-Id: Ifeb2c1d97a4c6dfeb1a7b5b26f1a3153e9f8da7f
diff --git a/libs/hwui/TextDropShadowCache.h b/libs/hwui/TextDropShadowCache.h
index ffccfa2..1e065d1 100644
--- a/libs/hwui/TextDropShadowCache.h
+++ b/libs/hwui/TextDropShadowCache.h
@@ -58,6 +58,7 @@
     SkTypeface* typeface;
     String8 str;
 
+    // TODO: Should take into account fake bold and text skew
     bool operator<(const ShadowText& rhs) const {
         LTE_INT(len) {
             LTE_INT(radius) {