Let SkBenchmark classes specify that they do no rendering.
Doing this gives us a 15-20% speedup in bench cycle time.
Here again I'm just picking the easy targets.

http://codereview.appspot.com/6500115/



git-svn-id: http://skia.googlecode.com/svn/trunk@5525 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/MemoryBench.cpp b/bench/MemoryBench.cpp
index d8d6052..30b9ea3 100644
--- a/bench/MemoryBench.cpp
+++ b/bench/MemoryBench.cpp
@@ -23,6 +23,7 @@
     ChunkAllocBench(void* param, size_t minSize) : INHERITED(param) {
         fMinSize = minSize;
         fName.printf("chunkalloc_" SK_SIZE_T_SPECIFIER, minSize);
+        fIsRendering = false;
     }
 
 protected: