Adds cache and buffer graphs to the properties pane.

ui/webui/resources/js/cr.js

Index: ui/webui/resources/js/cr.js
diff --git a/ui/webui/resources/js/cr.js b/ui/webui/resources/js/cr.js
index 3ea3b91dd8aac824544a8678608f122975ead79d..53f744c4e94782da0fd158226cd99d165833ea6a 100644
--- a/ui/webui/resources/js/cr.js
+++ b/ui/webui/resources/js/cr.js
@@ -351,13 +351,15 @@ this.cr = (function() {
     /**
      * Whether this uses GTK or not.
      */
-    cr.isGTK = typeof chrome.getVariableValue == 'function' &&
+    cr.isGTK = typeof chrome !== 'undefined' &&

[Ty Overby, 2013/09/09 17:45:55]

The reason for this check is that inside of a webui_resource_browsertest,
'chrome' is not defined.  To let cr.js work in this environment, a check here is
required. 

[scherkus (not reviewing), 2013/09/09 17:48:28]

To elaborate, content-based browsers (e.g., content_shell) can use
ui/webui/resources/js/* but won't necessarily define "chrome" APIs

[arv (Not doing code reviews), 2013/09/09 18:02:19]

Please add chrome to your test instead.

[Charlie Reis, 2013/09/09 18:02:22]

Can these thoughts be added as a comment in the code?

[Ty Overby, 2013/09/09 18:28:13]

See my comment in reply to your comment in main.js

+        typeof chrome.getVariableValue == 'function' &&
         /GTK/.test(chrome.getVariableValue('toolkit'));
 
     /**
      * Whether this uses the views toolkit or not.
      */
-    cr.isViews = typeof chrome.getVariableValue == 'function' &&
+    cr.isViews = typeof chrome !== 'undefined' &&
+        typeof chrome.getVariableValue == 'function' &&
         /views/.test(chrome.getVariableValue('toolkit'));
   }