Implementing --app-launcher install/uninstall flow.

chrome/app/chromium_strings.grd

Index: chrome/app/chromium_strings.grd
diff --git a/chrome/app/chromium_strings.grd b/chrome/app/chromium_strings.grd
index 73737c0ddb7e7d781446f12a110f05e3a3adc7dc..4509bb4a5963a21152852ac8bc1ba4c913cab3b4 100644
--- a/chrome/app/chromium_strings.grd
+++ b/chrome/app/chromium_strings.grd
@@ -217,6 +217,9 @@ be available for now. -->
       <message name="IDS_PRODUCT_DESCRIPTION" desc="Browser description">
         Chromium 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 Chromium.
       </message>
+      <message name="IDS_APP_LAUNCHER_PRODUCT_DESCRIPTION" desc="App Launcher description">
+        Chromium App Launcher is a standalone platform for Chromium apps.
+      </message>
       <if expr="pp_ifdef('chromeos')">
         <message name="IDS_PRODUCT_OS_NAME" desc="The Chrome OS application name">
           Chromium OS
@@ -349,6 +352,9 @@ be available for now. -->
       <message name="IDS_UNINSTALL_CHROME" desc="The text of the shortcut in the Start Menu for uninstalling chrome.">
         Uninstall Chromium
       </message>
+      <message name="IDS_UNINSTALL_APP_LAUNCHER" desc="The text of the shortcut in the Start Menu for uninstalling App Launcher.">
+        Uninstall Chromium App Launcher
+      </message>
       <message name="IDS_FIRSTRUN_DLG_TITLE" desc="Dialog title for first-run dialog">
         Welcome to Chromium
       </message>
@@ -549,6 +555,9 @@ Chromium is unable to recover your settings.
       <message name="IDS_SHORTCUT_TOOLTIP" desc="Text for the hover-on tooltip for the Chromium 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 Chromium 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>