Made more benchs non-rendering

http://codereview.appspot.com/6498132/



git-svn-id: http://skia.googlecode.com/svn/trunk@5562 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/ChecksumBench.cpp b/bench/ChecksumBench.cpp
index fe3fd47..818b9e3 100644
--- a/bench/ChecksumBench.cpp
+++ b/bench/ChecksumBench.cpp
@@ -23,6 +23,7 @@
         for (int i = 0; i < U32COUNT; ++i) {
             fData[i] = rand.nextU();
         }
+        fIsRendering = false;
     }
 
 protected: