Converts most of WorkspaceLayoutManager tests to use common code

ash/mus/bridge/wm_window_mus.cc

Index: ash/mus/bridge/wm_window_mus.cc
diff --git a/ash/mus/bridge/wm_window_mus.cc b/ash/mus/bridge/wm_window_mus.cc
index b52b740e9832d85ca16cd0b0bd2d2b23eb6bc34f..dfd334918526d537e7b4b709a3d58834ebd60412 100644
--- a/ash/mus/bridge/wm_window_mus.cc
+++ b/ash/mus/bridge/wm_window_mus.cc
@@ -247,11 +247,23 @@ bool WmWindowMus::IsBubble() {
 }
 
 ui::Layer* WmWindowMus::GetLayer() {
-  // TODO(sky): this function should be nuked entirely.
+  // TODO: http://crbug.com/652877.
   NOTIMPLEMENTED();
   return widget_ ? widget_->GetLayer() : nullptr;
 }
 
+bool WmWindowMus::GetLayerTargetVisibility() {
+  // TODO: http://crbug.com/652877.
+  NOTIMPLEMENTED();
+  return GetTargetVisibility();
+}
+
+bool WmWindowMus::GetLayerVisible() {
+  // TODO: http://crbug.com/652877.
+  NOTIMPLEMENTED();
+  return IsVisible();
+}
+
 display::Display WmWindowMus::GetDisplayNearestWindow() {
   // TODO(sky): deal with null rwc.
   return GetRootWindowControllerMus()->GetDisplay();
@@ -740,6 +752,11 @@ void WmWindowMus::StackChildBelow(WmWindow* child, WmWindow* target) {
                                ui::mojom::OrderDirection::BELOW);
 }
 
+void WmWindowMus::SetPinned(bool trusted) {
+  // http://crbug.com/622486.
+  NOTIMPLEMENTED();
+}
+
 void WmWindowMus::SetAlwaysOnTop(bool value) {
   mus::SetAlwaysOnTop(window_, value);
 }