Wire up configurations properly in VisualBench

tools/VisualBench/VisualFlags.cpp

Index: tools/VisualBench/VisualFlags.cpp
diff --git a/tools/VisualBench/VisualFlags.cpp b/tools/VisualBench/VisualFlags.cpp
index 2b0e5499eda3bce5236dc53f55d049b9bf6408f2..eade49edbfaa2d78106b1d4d7a33354ffd31dd93 100644
--- a/tools/VisualBench/VisualFlags.cpp
+++ b/tools/VisualBench/VisualFlags.cpp
@@ -7,5 +7,24 @@
 
 #include "VisualFlags.h"
 
-DEFINE_int32(msaa, 0, "Number of msaa samples.");
-DEFINE_bool(nvpr, false, "Run in NVPR mode?");
+SkString Configs::Config::humanReadable() const {
+    SkString out;
+    switch (fType) {
+        case kGpu_Type:
+            out.append("gpu");
+            break;
+        case kMsaa_Type:
+            out.appendf("msaa_%d", fNumSamples);
+            break;
+        case kNvpr_Type:
+            out.appendf("nvprmsaa_%d", fNumSamples);
+            break;
+        case kCpu_Type:
+            out.append("cpu");
+            break;
+    }
+    return out;
+}
+
+DEFINE_string(config, "gpu", "Options: "
+              "cpu gpu msaa16 msaa4 nvprmsaa16 nvprmsaa4");