Support an --install-from-webstore command line switch

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index b6fd0adfd9002293394edeeddd192e4b4a341c0b..6b38c46251a41f2d9c177010f4326550d7b55c0c 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -91,6 +91,13 @@ const char kAppsGalleryURL[]                = "apps-gallery-url";
 // The update url used by gallery/webstore extensions.
 const char kAppsGalleryUpdateURL[]          = "apps-gallery-update-url";
 
+// Causes Chrome to attempt to get metadata from the webstore for the
+// app/extension id given, and then prompt the user to download and install it.
+const char kInstallFromWebstore[]    = "install-from-webstore";
+
+// TODO(asargent) - remove this flag and change uses of it to instead use
+// kInstallFromWebstore.
+//
 // Specifies the URL of an application manifest to retrieve. The user will be
 // prompted for consent and the application retrieved/installed if consented.
 const char kAppsInstallFromManifestURL[]    = "apps-install-from-manifest-url";