Add a hang monitor for Pepper plugins

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index aea5e8102ac49c438d0dba2e5b0d99603dda071f..7b24c584146365db72d7d7068bc5dcffb95c81ec 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6110,6 +6110,12 @@ The following plug-in is unresponsive: <ph name="PLUGIN_NAME">$1
       <message name="IDS_BROWSER_HANGMONITOR_RENDERER_END" desc="The label of the 'kill' button">
         Kill pages
       </message>
+      <message name="IDS_BROWSER_HANGMONITOR_PLUGIN_INFOBAR" desc="The text of the infobar notifying the user that a plugin has hung">
+        A plug-in (<ph name="URL">$1<ex>Flash</ex></ph>) isn't responding.

[yzshen1, 2012/04/11 18:30:46]

nit: It is better to name it something like "plugin_name" instead of "URL".

+      </message>
+      <message name="IDS_BROWSER_HANGMONITOR_PLUGIN_INFOBAR_KILLBUTTON" desc="The button on the hung plugin infobar (...PLUGIN_INFOBAR above) to terminate the plugin">
+        Stop plug-in
+      </message>
 
       <!-- Passwords and Exceptions Dialog -->
       <message name="IDS_PASSWORDS_EXCEPTIONS_WINDOW_TITLE" desc="Title for 'Passwords and exceptions dialog'">