Change show/hide password button image. Changed to ToggleImageButton. Added tooltip to the button.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 10968 matching lines @@
       </message>
       <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_CERT_BUTTON" desc="In settings Internet options, the prompt on the certificate-selection button.">
         Select certificate file
       </message>
       <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_SECURITY" desc="In settings Internet options, the label for the security.">
         Security:
       </message>
       <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_PASSPHRASE" desc="In settings Internet options, the label for the passphrase.">
         Password:
       </message>
+      <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_PASSPHRASE_SHOW" desc="In settings Internet options, the label for the passphrase visible toggle button to show passphrase.">
+        Click to show password
+      </message>
+      <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_PASSPHRASE_HIDE" desc="In settings Internet options, the label for the passphrase visible toggle button to hide passphrase.">
+        Click to hide password
+      </message>
       <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_SAVE_CREDENTIALS" desc="In settings Internet options, the label for the checkbox to save identity and password.">
         Save identity and password
       </message>
       <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_ADVANCED_BUTTON" desc="In settings Internet options, Join other network, the text on the button to show advanced settings.">
         Advanced
       </message>
       <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_BAD_PASSPHRASE" desc="In settings Internet options, the label for the bad passphrase.">
         Incorrect password.
       </message>
       <message name="IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_NET_PROTECTED" desc="In settings Internet options, the message in network details page for password protected networks.">
@@ skipping 2356 matching lines @@
     </includes>
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>