Implementing --app-launcher install/uninstall flow.

chrome/app/google_chrome_strings.grd

Index: chrome/app/google_chrome_strings.grd
diff --git a/chrome/app/google_chrome_strings.grd b/chrome/app/google_chrome_strings.grd
index be2e6d1826d26c05d40c9766a0e1edf7df000012..ee685825041ce0d192cd63eb6c072b11c497179b 100644
--- a/chrome/app/google_chrome_strings.grd
+++ b/chrome/app/google_chrome_strings.grd
@@ -140,6 +140,9 @@ Chrome supports. -->
       <message name="IDS_PRODUCT_DESCRIPTION" desc="Browser description">
         Google Chrome is a web browser that runs webpages and applications with lightning speed. It's fast, stable, and easy to use. Browse the web more safely with malware and phishing protection built into Google Chrome.
       </message>
+      <message name="IDS_APP_LAUNCHER_PRODUCT_DESCRIPTION" desc="App Launcher description">
+        Google Chrome App Launcher is a standalone platform for Chrome apps.
+      </message>
       <if expr="pp_ifdef('chromeos')">
         <message name="IDS_PRODUCT_OS_NAME" desc="The Chrome OS application name">
           Google Chrome OS
@@ -473,6 +476,9 @@ Google Chrome is unable to recover your settings.
       <message name="IDS_SHORTCUT_TOOLTIP" desc="Text for the hover-on tooltip for the Google Chrome shortcuts.">
         Access the Internet
       </message>
+      <message name="IDS_APP_LAUNCHER_SHORTCUT_TOOLTIP" desc="Text for the hover-on tooltip for the App Launcher shortcut.">
+        Launch Chrome apps
+      </message>
       <message name="IDS_UNINSTALL_DELETE_PROFILE" desc="Text to show user to ask whether to delete all the profile data also during uninstallation.">
         Also delete your browsing data?
       </message>