Add a simple scheduler for animation frames

mc/scheduler/BUILD.gn

Index: mc/scheduler/BUILD.gn
diff --git a/services/js/modules/clock/BUILD.gn b/mc/scheduler/BUILD.gn
similarity index 59%
copy from services/js/modules/clock/BUILD.gn
copy to mc/scheduler/BUILD.gn
index 815ea319f7cb3f65f49a5061f0bf3c23ba8d788b..acb155a08e9440784b05e9b568125bcd9203e762 100644
--- a/services/js/modules/clock/BUILD.gn
+++ b/mc/scheduler/BUILD.gn
@@ -2,16 +2,17 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("clock") {
-  deps = [
-    "//base",
-    "//gin",
-    "//mojo/edk/js",
-    "//v8",
+static_library("scheduler") {
+  sources = [
+    "scheduler.cc",
+    "scheduler.h",
+    "time_interval.cc",
+    "time_interval.h",
+    "timer.cc",
+    "timer.h",
   ]
 
-  sources = [
-    "monotonic_clock.cc",
-    "monotonic_clock.h",
+  deps = [
+    "//base",
   ]
 }