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/SkBenchmark.cpp b/bench/SkBenchmark.cpp
index c8552d5..6afcd8e 100644
--- a/bench/SkBenchmark.cpp
+++ b/bench/SkBenchmark.cpp
@@ -19,6 +19,7 @@
     fForceAA = true;
     fDither = SkTriState::kDefault;
     fHasStrokeWidth = false;
+    fIsRendering = true;
 }
 
 const char* SkBenchmark::getName() {