Add a control benchmark.

I'm thinking of using this in perf with something like:
   ratio(fill(filter("test=foo")), fill(filter("test=control")))

Does that make sense to you?

Not sure that this is really a good control bench on all bots,
but I propose we just run it a bit and find out if it needs work.

BUG=skia:

Review URL: https://codereview.chromium.org/1129823003

1 files changed, 1 insertions, 0 deletions

diff --git a/gyp/bench.gypi b/gyp/bench.gypi
index 3d041f6314..3e87f6bc8c 100644
--- a/gyp/bench.gypi
+++ b/gyp/bench.gypi
@@ -45,6 +45,7 @@
     '../bench/ColorCubeBench.cpp',
     '../bench/ColorFilterBench.cpp',
     '../bench/ColorPrivBench.cpp',
+    '../bench/ControlBench.cpp',
     '../bench/CoverageBench.cpp',
     '../bench/DashBench.cpp',
     '../bench/DeferredSurfaceCopyBench.cpp',