OK windows, please take my infinity.

BUG=

Review URL: https://codereview.chromium.org/23526045

git-svn-id: http://skia.googlecode.com/svn/trunk@11272 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/benchmain.cpp b/bench/benchmain.cpp
index 9873c72..8764313 100644
--- a/bench/benchmain.cpp
+++ b/bench/benchmain.cpp
@@ -30,6 +30,8 @@
 #include "SkPicture.h"
 #include "SkString.h"
 
+#include <limits>
+
 enum BenchMode {
     kNormal_BenchMode,
     kDeferred_BenchMode,
@@ -549,7 +551,7 @@
             BenchTimer timer;
 #endif
 
-            double previous = 1.0/0.0;
+            double previous = std::numeric_limits<double>::infinity();
             bool converged = false;
             bench->setLoops(0);
             if (FLAGS_verbose) { SkDebugf("%s %s: ", bench->getName(), config.name); }