Add Mojo IPC based input-device service.

components/mus/public/interfaces/input_devices/BUILD.gn

Index: components/mus/public/interfaces/input_devices/BUILD.gn
diff --git a/components/password_manager/content/public/interfaces/BUILD.gn b/components/mus/public/interfaces/input_devices/BUILD.gn
similarity index 73%
copy from components/password_manager/content/public/interfaces/BUILD.gn
copy to components/mus/public/interfaces/input_devices/BUILD.gn
index e032e8afb07a40e3e12b70a123f24b262d863f71..f2de99d1ae1c5c0b36bd979d4abe278b5adb322b 100644
--- a/components/password_manager/content/public/interfaces/BUILD.gn
+++ b/components/mus/public/interfaces/input_devices/BUILD.gn
@@ -4,12 +4,12 @@
 
 import("//mojo/public/tools/bindings/mojom.gni")
 
-mojom("interfaces") {
+mojom("input_devices") {
   sources = [
-    "credential_manager.mojom",
+    "input_device_server.mojom",
   ]
 
   public_deps = [
-    "//url/mojo:url_mojom_origin",
+    "//ui/events/devices/mojo",
   ]
 }