VisualBenchTest: Write JSON output

bench/ResultsWriter.h

Index: bench/ResultsWriter.h
diff --git a/bench/ResultsWriter.h b/bench/ResultsWriter.h
index f53a980de43d87c79e3ff45570e7064fdcdaf594..b8b9a2e5ed52ce5ac4fa12214ba37a04ed25b9da 100644
--- a/bench/ResultsWriter.h
+++ b/bench/ResultsWriter.h
@@ -12,6 +12,7 @@
 
 #include "BenchLogger.h"
 #include "SkJSONCPP.h"
+#include "SkOSFile.h"
 #include "SkStream.h"
 #include "SkString.h"
 #include "SkTArray.h"
@@ -116,6 +117,12 @@ public:
 
     // Flush to storage now please.
     virtual void flush() {
+        SkString dirname = SkOSPath::Dirname(fFilename.c_str());
+        if (!sk_exists(dirname.c_str(), kWrite_SkFILE_Flag)) {
+            if (!sk_mkdir(dirname.c_str())) {
+                SkDebugf("Failed to create directory.");
+            }
+        }
         SkFILEWStream stream(fFilename.c_str());
         stream.writeText(Json::StyledWriter().write(fRoot).c_str());
         stream.flush();