Expose new file browser as chrome:files

BUG=chromium-os:14342
TEST=ExtensionManifestTest.FileManagerURLOverride, ExtensionURLRewriteBrowserTest.FileManagerURL

Review URL: http://codereview.chromium.org/7366003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@93002 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/common/url_constants.cc b/chrome/common/url_constants.cc
index d818d1d..039c5dc 100644
--- a/chrome/common/url_constants.cc
+++ b/chrome/common/url_constants.cc
@@ -93,6 +93,10 @@
 const char kChromeUIUserImageURL[] = "chrome://userimage/";
 #endif
 
+#if defined(FILE_MANAGER_EXTENSION)
+const char kChromeUIFileManagerURL[] = "chrome://files/";
+#endif
+
 // Add Chrome UI hosts here, in alphabetical order.
 // Add hosts to kChromePaths in browser_about_handler.cc to be listed by
 // chrome://chrome-urls (about:about) and the built-in AutocompleteProvider.
@@ -202,6 +206,10 @@
 const char kOemEulaURLPath[] = "oem";
 #endif
 
+#if defined(FILE_MANAGER_EXTENSION)
+const char kChromeUIFileManagerHost[] = "files";
+#endif
+
 // Option sub pages.
 // Add sub page paths to kChromeSettingsSubPages in builtin_provider.cc to be
 // listed by the built-in AutocompleteProvider.