Disable blend for edge AA not general AA

Review URL: http://codereview.appspot.com/4526051/




git-svn-id: http://skia.googlecode.com/svn/trunk@1316 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrDrawTarget.cpp b/gpu/src/GrDrawTarget.cpp
index 5e51513..518b4ee 100644
--- a/gpu/src/GrDrawTarget.cpp
+++ b/gpu/src/GrDrawTarget.cpp
@@ -479,7 +479,7 @@
 
 bool GrDrawTarget::canDisableBlend() const {
     // If we're using edge antialiasing, we can't force blend off.
-    if (fCurrDrawState.fFlagBits & kAntialias_StateBit) {
+    if (fCurrDrawState.fFlagBits & kEdgeAA_StateBit) {
         return false;
     }