[cc-frame-viewer] Panoply of fixes

tools/cc-frame-viewer/app/viewer.js

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 'use strict';
 
 base.exportTo('ccfv', function() {
   function assert(bool) {
     if (bool)
       return;
@@ skipping 11 matching lines @@
 
     var num_args = launch_event.args[0]
     chromeapp.sendEvent('load', 'please', onLoadResult, onLoadError);
   }
 
   function onLoadResult(res) {
     var trace = JSON.parse(res);
 
     window.g_lastResult = trace;
     var model = new ccfv.Model();
-    model.initFromTraceEvents(trace);
+    try {
+        model.initFromTraceEvents(trace);
+    } catch(e) {
+        onLoadError(e);
+        return;
+    }
     window.g_model = model;
 
     var modelViewEl = new ccfv.ModelView();
     modelViewEl.model = model;
     window.g_modelViewEl = modelViewEl;
 
     viewerEl.appendChild(modelViewEl);
   }
 
   function onLoadError(err) {
     viewerEl.textContent = 'error loading: ' + err;
   }
 
   function onClosed() {
     chromeapp.exit(1);
   }
 
 });