Adding keyboard service.

shell/android/mojo_main.cc

Index: shell/android/mojo_main.cc
diff --git a/shell/android/mojo_main.cc b/shell/android/mojo_main.cc
index 502a34063aca5419a4133649e668ee91bfb3a66f..9c8178b10073afbd692f3136ef93f17c8bbc9f3e 100644
--- a/shell/android/mojo_main.cc
+++ b/shell/android/mojo_main.cc
@@ -83,6 +83,10 @@ void ConfigureAndroidServices(Context* context) {
           make_scoped_ptr(new AndroidHandlerLoader()), "android_handler",
           base::MessageLoop::TYPE_DEFAULT)),
       GURL("mojo:android_handler"));
+
+  // By default, the keyboard is handled by the native_viewport_service.
+  context->mojo_url_resolver()->AddCustomMapping(
+      GURL("mojo:keyboard"), GURL("mojo:native_viewport_service"));
 }
 
 void QuitShellThread() {