Make GrRenderTarget[(Proxy)|(Context)]? advertise a "full scene aa type".

Bug: skia:
Change-Id: I24549604e8305028e34e0022bfef992a8e8c33f7
Reviewed-on: https://skia-review.googlesource.com/16230
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrReducedClip.cpp b/src/gpu/GrReducedClip.cpp
index 28ba47c..b7ffa7b 100644
--- a/src/gpu/GrReducedClip.cpp
+++ b/src/gpu/GrReducedClip.cpp
@@ -704,7 +704,7 @@
     for (ElementList::Iter iter(fElements); iter.get(); iter.next()) {
         const Element* element = iter.get();
         GrAAType aaType = GrAAType::kNone;
-        if (element->isAA() && renderTargetContext->isStencilBufferMultisampled()) {
+        if (element->isAA() && GrFSAAType::kNone != renderTargetContext->fsaaType()) {
             aaType = GrAAType::kMSAA;
         }