Make drawRect preserve vertex attrib state and push/pop the geom sources.

Also, add some balancing calls for setIndexSource*()
Review URL: https://codereview.chromium.org/13468004

git-svn-id: http://skia.googlecode.com/svn/trunk@8499 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrAAHairLinePathRenderer.cpp b/src/gpu/GrAAHairLinePathRenderer.cpp
index 08a4111..343fca0 100644
--- a/src/gpu/GrAAHairLinePathRenderer.cpp
+++ b/src/gpu/GrAAHairLinePathRenderer.cpp
@@ -842,6 +842,7 @@
                             kIdxsPerQuad*n);                   // iCount
         quads += n;
     }
+    target->resetIndexSource();
 
     return true;
 }