Add the keys used by the back/forward menu items to the accelerator map so that we can locate sensible shortcut text for them rather than asking Windows.

http://crbug.com/14070
TEST=see bug

Review URL: http://codereview.chromium.org/149302

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20121 0039d316-1c4b-4281-b951-d872f2087c98

app/resources/app_strings.grd

@@ -304,6 +304,9 @@ need to be translated for each locale.-->
       <message name="IDS_APP_F11_KEY" desc="F11 key">
         F11
       </message>
+      <message name="IDS_APP_BACKSPACE_KEY" desc="Backspace key">
+        Backspace
+      </message>
 
       <!-- Shortcut Modifiers -->
       <message name="IDS_APP_CONTROL_MODIFIER" desc="Control key shortcut modifier">

views/accelerator.cc

@@ -43,6 +43,15 @@ std::wstring Accelerator::GetShortcutText() const {
   case VK_DELETE:
     string_id = IDS_APP_DELETE_KEY;
     break;
+  case VK_LEFT:
+    string_id = IDS_APP_LEFT_ARROW_KEY;
+    break;
+  case VK_RIGHT:
+    string_id = IDS_APP_RIGHT_ARROW_KEY;
+    break;
+  case VK_BACK:
+    string_id = IDS_APP_BACKSPACE_KEY;
+    break;
   case VK_F1:
     string_id = IDS_APP_F1_KEY;
     break;