MD: Implement tab button for location bar's tab to search message

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 9cd320567ef9ada059e029823da1a90c73538ffe..422225b36c4ba20b351fce7ca331212d1555a4a7 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -7097,6 +7097,9 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_OMNIBOX_EXTENSION_KEYWORD_HINT" desc="Shown to the user when the word(s) in the omnibox has an extension keyword associated with it. $1 is replaced with an image showing the tab key. $2 is replaced with the description of the keyword.">
         Press <ph name="SEARCH_KEY">$1<ex>Tab</ex></ph> to send commands to <ph name="EXTENSION_NAME">$2<ex>Google Talk</ex></ph>
       </message>
+      <message name="IDS_TAB_KEY" desc="The name of the tab key. This should match the typical physical appearance of the tab key in the locale." meaning="The tab key on a keyboard.">
+        Tab
+      </message>
       <message name="IDS_OMNIBOX_KEYWORD_TEXT" desc="Text shown in the search button at the front of the omnibox when the user has selected a keyword">
         Search <ph name="SITE_NAME">$1<ex>google.com</ex></ph>:
       </message>