NOT FOR REVIEW: Aura Android: Content Shell compiles

ui/aura/window_tree_host_platform.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/window_tree_host_platform.h"
 
 #include "base/trace_event/trace_event.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/compositor/compositor.h"
 #include "ui/events/event.h"
@@ skipping 33 matching lines @@
 #elif defined(OS_ANDROID)
   window_.reset(new ui::PlatformWindowAndroid(this));
 #else
   NOTIMPLEMENTED();
 #endif
 }
 
 WindowTreeHostPlatform::WindowTreeHostPlatform()
     : widget_(gfx::kNullAcceleratedWidget),
       current_cursor_(ui::kCursorNull),
-      has_capture_(false) {}
+      has_capture_(false) {
+  CreateCompositor();
+}
 
 void WindowTreeHostPlatform::SetPlatformWindow(
     scoped_ptr<ui::PlatformWindow> window) {
   window_ = window.Pass();
 }
 
 WindowTreeHostPlatform::~WindowTreeHostPlatform() {
   DestroyCompositor();
   DestroyDispatcher();
 }
@@ skipping 129 matching lines @@
   DCHECK_EQ(widget, widget_);
   widget_ = gfx::kNullAcceleratedWidget;
 }
 
 void WindowTreeHostPlatform::OnActivationChanged(bool active) {
   if (active)
     OnHostActivated();
 }
 
 }  // namespace aura