Converts most of WorkspaceLayoutManager tests to use common code

ash/aura/wm_window_aura.cc

Index: ash/aura/wm_window_aura.cc
diff --git a/ash/aura/wm_window_aura.cc b/ash/aura/wm_window_aura.cc
index e4dd197759e5cb574ccbc00d6dd6f9cbbbd2f347..0bff46ef796b6eaf2eaa81cd1e5c03b1ed5e02d3 100644
--- a/ash/aura/wm_window_aura.cc
+++ b/ash/aura/wm_window_aura.cc
@@ -199,6 +199,14 @@ ui::Layer* WmWindowAura::GetLayer() {
   return window_->layer();
 }
 
+bool WmWindowAura::GetLayerTargetVisibility() {
+  return GetLayer()->GetTargetVisibility();
+}
+
+bool WmWindowAura::GetLayerVisible() {
+  return GetLayer()->visible();
+}
+
 display::Display WmWindowAura::GetDisplayNearestWindow() {
   return display::Screen::GetScreen()->GetDisplayNearestWindow(window_);
 }
@@ -626,6 +634,10 @@ void WmWindowAura::StackChildBelow(WmWindow* child, WmWindow* target) {
   window_->StackChildBelow(GetAuraWindow(child), GetAuraWindow(target));
 }
 
+void WmWindowAura::SetPinned(bool trusted) {
+  wm::PinWindow(window_, trusted);
+}
+
 void WmWindowAura::SetAlwaysOnTop(bool value) {
   window_->SetProperty(aura::client::kAlwaysOnTopKey, value);
 }