[iOS Clean] Created OverlayService.

ios/clean/chrome/browser/ui/overlay_service/internal/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("web_contents") {
+source_set("internal") {

[marq (ping after 24h), 2017/06/23 10:42:01]

I'm not sure that the internal/ subdirectory is useful here, unless we start
enforcing dependencies. But overall I don't think we're at the point where we're
defining hard API boundaries like this yet.

(And wouldn't overlay_queue.h also need to be a public header?)

   sources = [
-    "web_contents_mediator.h",
-    "web_contents_mediator.mm",
-    "web_coordinator.h",
-    "web_coordinator.mm",
+    "browser_coordinator+overlay_support.mm",
+    "browser_overlay_queue.h",
+    "browser_overlay_queue.mm",
+    "overlay_queue.h",
+    "overlay_queue.mm",
+    "overlay_queue_observer.h",
+    "overlay_scheduler.h",
+    "overlay_scheduler.mm",
+    "overlay_service_factory.mm",
+    "overlay_service_impl.h",
+    "overlay_service_impl.mm",
+    "web_state_overlay_queue.h",
+    "web_state_overlay_queue.mm",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 
   deps = [
-    ":web_contents_ui",
-    "//ios/chrome/browser",
+    "//base",
+    "//components/keyed_service/core",
+    "//components/keyed_service/ios",
+    "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/web_state_list",
     "//ios/clean/chrome/browser/ui/commands",
-    "//ios/clean/chrome/browser/ui/context_menu",
+    "//ios/clean/chrome/browser/ui/overlay_service:overlay_service_headers",
     "//ios/shared/chrome/browser/ui/browser_list",
     "//ios/shared/chrome/browser/ui/commands",
     "//ios/shared/chrome/browser/ui/coordinators",
     "//ios/web",
-    "//ui/base",
-    "//url",
   ]
 }
 
-source_set("web_contents_ui") {
-  sources = [
-    "web_contents_consumer.h",
-    "web_contents_view_controller.h",
-    "web_contents_view_controller.mm",
-  ]
-
-  configs += [ "//build/config/compiler:enable_arc" ]
-}
-
 source_set("unit_tests") {
   testonly = true
   sources = [
-    "web_contents_mediator_unittest.mm",
+    "overlay_queue_unittest.mm",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 
   deps = [
-    ":web_contents",
-    ":web_contents_ui",
+    ":internal",
     "//base",
     "//base/test:test_support",
     "//ios/chrome/browser/web_state_list",
     "//ios/chrome/browser/web_state_list:test_support",
     "//ios/chrome/test/base",
+    "//ios/clean/chrome/browser/ui/commands",
+    "//ios/clean/chrome/browser/ui/overlay_service",
+    "//ios/shared/chrome/browser/ui/coordinators",
     "//ios/web/public/test/fakes",
     "//testing/gtest",
   ]
 }