mus: Introduce high-contrast mode in mus.

services/ui/service.cc

Index: services/ui/service.cc
diff --git a/services/ui/service.cc b/services/ui/service.cc
index bb5f04451e7220356d1d4d693dc263955f2ae440..73b16672e7b0929bd8f7e1cf75a98c27708daccf 100644
--- a/services/ui/service.cc
+++ b/services/ui/service.cc
@@ -22,6 +22,7 @@
 #include "services/ui/gles2/gpu_impl.h"
 #include "services/ui/gpu/gpu_service_impl.h"
 #include "services/ui/gpu/gpu_service_mus.h"
+#include "services/ui/ws/accessibility_manager.h"
 #include "services/ui/ws/display.h"
 #include "services/ui/ws/display_binding.h"
 #include "services/ui/ws/display_manager.h"
@@ -75,6 +76,7 @@ struct Service::PendingRequest {
 
 struct Service::UserState {
   std::unique_ptr<clipboard::ClipboardImpl> clipboard;
+  std::unique_ptr<ws::AccessibilityManager> accessibility;
   std::unique_ptr<ws::WindowTreeHostFactory> window_tree_host_factory;
 };
 
@@ -224,6 +226,7 @@ void Service::OnStart(shell::Connector* connector,
 }
 
 bool Service::OnConnect(Connection* connection) {
+  connection->AddInterface<mojom::AccessibilityManager>(this);
   connection->AddInterface<mojom::Clipboard>(this);
   connection->AddInterface<mojom::DisplayManager>(this);
   connection->AddInterface<mojom::UserAccessManager>(this);
@@ -281,6 +284,16 @@ void Service::CreateDefaultDisplays() {
 }
 
 void Service::Create(shell::Connection* connection,
+                     mojom::AccessibilityManagerRequest request) {
+  UserState* user_state = GetUserState(connection);
+  if (!user_state->accessibility) {
+    user_state->accessibility.reset(
+        new ws::AccessibilityManager(window_server_.get()));
+  }
+  user_state->accessibility->Bind(std::move(request));
+}
+
+void Service::Create(shell::Connection* connection,
                      mojom::ClipboardRequest request) {
   UserState* user_state = GetUserState(connection);
   if (!user_state->clipboard)