Initialize command line arguments for Mojo apptests.

mojo/shell/switches.cc

Index: mojo/shell/switches.cc
diff --git a/mojo/shell/switches.cc b/mojo/shell/switches.cc
index 28e7d058a41a77440e2d23c48a47cf79ff902f3f..af589b7040af7d53fc692b32d81523407f6731e2 100644
--- a/mojo/shell/switches.cc
+++ b/mojo/shell/switches.cc
@@ -51,8 +51,18 @@ const char kOrigin[] = "origin";
 // their content.
 const char kPredictableAppFilenames[] = "predictable-app-filenames";
 
+// If specified, test application(s) listed on the command line will be run,
+// instead of the default application, mojo:window_manager.
+const char kTestApp[] = "test-app";
+
 // Starts tracing when the shell starts up, saving a trace file on disk after 5
 // seconds or when the shell exits.
 const char kTraceStartup[] = "trace-startup";
 
+// Specifies a set of mappings to apply when resolving urls. The value is a set
+// of ',' separated mappings, where each mapping consists of a pair of urls
+// giving the to/from url to map. For example, 'a=b,c=d' contains two mappings,
+// the first maps 'a' to 'b' and the second 'c' to 'd'.
+const char kURLMappings[] = "url-mappings";
+
 }  // namespace switches