Make benchmark suite support the |cache| option

Both the browser and the command-line version of the benchmark suite
runner now allow users to specify a value of the |cache| option.

benchmark/index.css

@@ -30,5 +30,5 @@ a, a:visited { color: #3d586c; }
   background-color: #f0f0f0;
 }
 #options #run-count { width: 3em; }
-#options #track-line-and-column { margin-left: 2em; }
+#options #cache, #options #track-line-and-column { margin-left: 2em; }
 #options #run { width: 5em; margin-left: 2em; }

benchmark/index.html

@@ -11,6 +11,8 @@
     <div id="options">
       <label for="run-count">Run each test</label>
       <input type="text" id="run-count" value="10"> times
+      <input type="checkbox" id="cache">
+      <label for="cache">Use results cache</label>
       <input type="checkbox" id="track-line-and-column">
       <label for="track-line-and-column">Track line and column</label>
       <input type="button" id="run" value="Run">

benchmark/index.js

@@ -63,6 +63,7 @@ $("#run").click(function() {
   }
 
   var options = {
+    cache:              $("#cache").is(":checked"),
     trackLineAndColumn: $("#track-line-and-column").is(":checked")
   };
 
@@ -105,7 +106,7 @@ $("#run").click(function() {
     },
 
     start: function() {
-      $("#run-count, #track-line-and-column, #run").attr("disabled", "disabled");
+      $("#run-count, #cache, #track-line-and-column, #run").attr("disabled", "disabled");
 
       resultsTable.show();
       $("#results-table tr").slice(1).remove();
@@ -122,7 +123,7 @@ $("#run").click(function() {
 
       $.scrollTo("max", { axis: "y", duration: 500 });
 
-      $("#run-count, #track-line-and-column, #run").removeAttr("disabled");
+      $("#run-count, #cache, #track-line-and-column, #run").removeAttr("disabled");
     }
   });
 

benchmark/run

@@ -80,6 +80,7 @@ function printHelp() {
   util.puts("");
   util.puts("Options:");
   util.puts("  -n, --run-count <n>          number of runs (default: 10)");
+  util.puts("      --cache                  make tested parsers cache results");
   util.puts("      --track-line-and-column  make tested parsers track line and column");
 }
 
@@ -127,6 +128,10 @@ while (args.length > 0 && isOption(args[0])) {
       }
       break;
 
+    case "--cache":
+      options.cache = true;
+      break;
+
     case "--track-line-and-column":
       options.trackLineAndColumn = true;
       break;