Fix bench crash (calling method on NULL object).
Review URL: https://codereview.appspot.com/7305048

git-svn-id: http://skia.googlecode.com/svn/trunk@7603 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrTextContext.cpp b/src/gpu/GrTextContext.cpp
index 2a26dae..684b7f7 100644
--- a/src/gpu/GrTextContext.cpp
+++ b/src/gpu/GrTextContext.cpp
@@ -212,11 +212,13 @@
         if (flush) {
             this->flushGlyphs();
             fContext->flush();
+            // flushGlyphs() will reset fDrawTarget to NULL.
+            fDrawTarget = fContext->getTextTarget(fPaint);
+            fDrawTarget->drawState()->setVertexLayout(fVertexLayout);
         }
         fMaxVertices = kDefaultRequestedVerts;
         // ignore return, no point in flushing again.
-        fDrawTarget->geometryHints(&fMaxVertices,
-                                   NULL);
+        fDrawTarget->geometryHints(&fMaxVertices, NULL);
 
         int maxQuadVertices = 4 * fContext->getQuadIndexBuffer()->maxQuads();
         if (fMaxVertices < kMinRequestedVerts) {