c++ / mojo changes for 'external window mode'

services/ui/ws/window_tree.cc

Index: services/ui/ws/window_tree.cc
diff --git a/services/ui/ws/window_tree.cc b/services/ui/ws/window_tree.cc
index f642e1f1c3291f98d25ebcc946bb1336a56e9068..ebd20a768b688ce601a0df5c7d508a43fbb7fde0 100644
--- a/services/ui/ws/window_tree.cc
+++ b/services/ui/ws/window_tree.cc
@@ -100,7 +100,34 @@ void WindowTree::Init(std::unique_ptr<WindowTreeBinding> binding,
   if (roots_.empty())
     return;
 
+  DoOnEmbed(std::move(tree), nullptr /*ServerWindow*/);
+}
+
+void WindowTree::DoOnEmbed(mojom::WindowTreePtr tree,
+                           ServerWindow* root_window) {
+  bool in_external_window_mode = !!root_window;
+  if (in_external_window_mode) {
+    DCHECK(!tree);
+    CHECK_LE(1u, roots_.size());
+
+    Display* display = GetDisplay(root_window);
+    int64_t display_id =
+        display ? display->GetId() : display::kInvalidDisplayId;
+
+    ClientWindowId window_id;
+    IsWindowKnown(root_window, &window_id);
+
+    const bool drawn =
+        root_window->parent() && root_window->parent()->IsDrawn();
+    client()->OnEmbed(id_, WindowToWindowData(root_window),
+                      nullptr /*mojom::WindowTreePtr*/, display_id,
+                      window_id.id, drawn);
+    return;
+  }
+
   std::vector<const ServerWindow*> to_send;
+
+  DCHECK(!root_window);
   CHECK_EQ(1u, roots_.size());
   const ServerWindow* root = *roots_.begin();
   GetUnknownWindowsFrom(root, &to_send);
@@ -189,6 +216,22 @@ void WindowTree::PrepareForWindowServerShutdown() {
     window_manager_internal_ = binding_->GetWindowManager();
 }
 
+void WindowTree::AddRoot(const ServerWindow* root) {
+  DCHECK(pending_client_id_ != kInvalidClientId);
+
+  const ClientWindowId client_window_id(pending_client_id_);
+  DCHECK_EQ(0u, client_id_to_window_id_map_.count(client_window_id));
+
+  client_id_to_window_id_map_[client_window_id] = root->id();
+  window_id_to_client_id_map_[root->id()] = client_window_id;
+  pending_client_id_ = kInvalidClientId;
+
+  roots_.insert(root);
+
+  Display* display = GetDisplay(root);
+  DCHECK(display);
+}
+
 void WindowTree::AddRootForWindowManager(const ServerWindow* root) {
   DCHECK(window_manager_internal_);
   const ClientWindowId client_window_id(WindowIdToTransportId(root->id()));
@@ -2055,7 +2098,7 @@ bool WindowTree::IsWindowCreatedByWindowManager(
   // WindowManager attached, the window manager didn't create this window.
   const WindowManagerDisplayRoot* display_root =
       GetWindowManagerDisplayRoot(window);
-  if (!display_root)
+  if (!display_root || !display_root->window_manager_state())
     return false;
 
   return display_root->window_manager_state()->window_tree()->id() ==