Add better consistency check and error output to plot script.

tools/profviz/profviz.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 24 matching lines @@
   "../logreader.js",
   "../tickprocessor.js",
   "composer.js",
   "gnuplot-4.6.3-emscripten.js"
 ];
 
 
 function plotWorker() {
   var worker = null;
 
-  var delegateList = {
-    "log"         : log,
-    "error"       : logError,
-    "displayplot" : displayplot,
-    "displayprof" : displayprof,
-    "range"       : setRange,
-    "script"      : scriptLoaded
-  }
-
   function initialize() {
     ui.freeze();
     worker = new Worker("worker.js");
     running = false;
 
     worker.postMessage({ "call" : "load scripts",
                          "args" : worker_scripts });
 
     worker.addEventListener("message", function(event) {
       var call = delegateList[event.data["call"]];
@@ skipping 18 matching lines @@
       'range_start' : range_start,
       'range_end'   : range_end
     }
     worker.postMessage({ 'call' : 'run', 'args' : args });
   }
 
   this.reset = function() {
     if (worker) worker.terminate();
     initialize();
   }
+
+  var delegateList = {
+    "log"         : log,
+    "error"       : logError,
+    "displayplot" : displayplot,
+    "displayprof" : displayprof,
+    "range"       : setRange,
+    "script"      : scriptLoaded,
+    "reset"       : this.reset
+  }
 }
 
 
 function UIWrapper() {
   var input_elements = ["range_start",
                         "range_end",
                         "distortion",
                         "start",
                         "file"];
 
@@ skipping 124 matching lines @@
   }
 
   timer = Date.now();
   worker.run(file, kResX, kResY, distortion, range[0], range[1]);
 }
 
 
 function getSelectedFile() {
   var file = ui.file.files[0];
   if (!file) throw Error("No valid file selected.");
-  if (!file.type.toString().match(/text/)) {
-    throw Error("'" + escape(file.name) + "' is not a text file.");
-  }
   return file;
 }
 
 
 function getDistortion() {
   var input_distortion =
       parseInt(ui.distortion.value, 10);
   if (isNaN(input_distortion)) {
     input_distortion = ui.distortion.value = 4500;
   }
@@ skipping 29 matching lines @@
   worker.reset();
 }
 
 
 var kResX;
 var kResY;
 var error_logged;
 var ui;
 var worker;
 var timer;