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/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index e9f5be5..df6965d 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -611,10 +611,10 @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
-void GrDrawTarget::drawRect(const GrRect& rect,
-                            const SkMatrix* matrix,
-                            const GrRect* localRect,
-                            const SkMatrix* localMatrix) {
+void GrDrawTarget::onDrawRect(const GrRect& rect,
+                              const SkMatrix* matrix,
+                              const GrRect* localRect,
+                              const SkMatrix* localMatrix) {
     // position + (optional) texture coord
     static const GrVertexAttrib kAttribs[] = {
         {kVec2f_GrVertexAttribType, 0,               kPosition_GrVertexAttribBinding},