Finish eliminating PlatformWindowMus

ui/views/mus/window_tree_host_mus.cc

Index: ui/views/mus/window_tree_host_mus.cc
diff --git a/ui/views/mus/window_tree_host_mus.cc b/ui/views/mus/window_tree_host_mus.cc
index e360eb05b46ba0ed6769758e0e49a248ecd6b3d9..7aacf283586aadaefb9785852351cc9b82bd53d6 100644
--- a/ui/views/mus/window_tree_host_mus.cc
+++ b/ui/views/mus/window_tree_host_mus.cc
@@ -5,15 +5,21 @@
 #include "ui/views/mus/window_tree_host_mus.h"
 
 #include "base/memory/ptr_util.h"
+#include "components/bitmap_uploader/bitmap_uploader.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
+#include "ui/base/view_prop.h"
 #include "ui/events/event.h"
+#include "ui/platform_window/stub/stub_window.h"
 #include "ui/views/mus/input_method_mus.h"
 #include "ui/views/mus/native_widget_mus.h"
-#include "ui/views/mus/platform_window_mus.h"
 
 namespace views {
 
+namespace {
+static uint32_t accelerated_widget_count = 1;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // WindowTreeHostMus, public:
 
@@ -21,8 +27,35 @@ WindowTreeHostMus::WindowTreeHostMus(shell::Connector* connector,
                                      NativeWidgetMus* native_widget,
                                      mus::Window* window)
     : native_widget_(native_widget) {
-  SetPlatformWindow(
-      base::WrapUnique(new PlatformWindowMus(this, connector, window)));
+  // We need accelerated widget numbers to be different for each
+  // window and fit in the smallest sizeof(AcceleratedWidget) uint32_t
+  // has this property.
+#if defined(OS_WIN) || defined(OS_ANDROID)
+  gfx::AcceleratedWidget accelerated_widget =
+      reinterpret_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
+#else
+  gfx::AcceleratedWidget accelerated_widget =
+      static_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
+#endif
+
+  // TODO(markdittmer): StubWindow will call |OnAcceleratedWidgetAvailable| with
+  // device pixel ratio = 1. Really, this ratio should be consistent with that
+  // of |window|.
+  SetPlatformWindow(base::WrapUnique(
+      new ui::StubWindow(this, accelerated_widget)));
+
+  // If no connector was passed, then it's entirely possible that mojo has not
+  // been initialized and BitmapUploader will not work. This occurs, for
+  // example, in some unit test contexts.
+  if (connector) {
+    bitmap_uploader_.reset(new bitmap_uploader::BitmapUploader(window));
+    bitmap_uploader_->Init(connector);
+    prop_.reset(new ui::ViewProp(
+        accelerated_widget,
+        bitmap_uploader::kBitmapUploaderForAcceleratedWidget,
+        bitmap_uploader_.get()));
+  }
+
   // The location of events is already transformed, and there is no way to
   // correctly determine the reverse transform. So, don't attempt to transform
   // event locations, else the root location is wrong.
@@ -39,11 +72,6 @@ WindowTreeHostMus::~WindowTreeHostMus() {
   DestroyDispatcher();
 }
 
-PlatformWindowMus* WindowTreeHostMus::platform_window() {
-  return static_cast<PlatformWindowMus*>(
-      WindowTreeHostPlatform::platform_window());
-}
-
 void WindowTreeHostMus::DispatchEvent(ui::Event* event) {
   if (event->IsKeyEvent() && GetInputMethod()) {
     GetInputMethod()->DispatchKeyEvent(event->AsKeyEvent());