ozone: Port WindowTreeHostOzone on top of PlatformWindow

ui/ozone/platform/dri/ozone_platform_gbm.cc

Index: ui/ozone/platform/dri/ozone_platform_gbm.cc
diff --git a/ui/ozone/platform/dri/ozone_platform_gbm.cc b/ui/ozone/platform/dri/ozone_platform_gbm.cc
index 34939dbaeacc7b56972ad2679306fbd00b1fb0a3..08ff495da4f028857990043c1805a4ad59291327 100644
--- a/ui/ozone/platform/dri/ozone_platform_gbm.cc
+++ b/ui/ozone/platform/dri/ozone_platform_gbm.cc
@@ -11,6 +11,7 @@
 #include "base/at_exit.h"
 #include "ui/events/ozone/device/device_manager.h"
 #include "ui/events/ozone/evdev/event_factory_evdev.h"
+#include "ui/ozone/common/platform_window_base.h"
 #include "ui/ozone/platform/dri/cursor_factory_evdev_dri.h"
 #include "ui/ozone/platform/dri/dri_wrapper.h"
 #include "ui/ozone/platform/dri/gbm_buffer.h"
@@ -107,6 +108,12 @@ class OzonePlatformGbm : public OzonePlatform {
   virtual GpuPlatformSupportHost* GetGpuPlatformSupportHost() OVERRIDE {
     return gpu_platform_support_host_.get();
   }
+  virtual scoped_ptr<PlatformWindow> CreatePlatformWindow(
+      PlatformWindowDelegate* delegate,
+      const gfx::Rect& bounds) OVERRIDE {
+    return make_scoped_ptr<PlatformWindow>(
+        new PlatformWindowCompat(delegate, bounds));
+  }
 #if defined(OS_CHROMEOS)
   virtual scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate()
       OVERRIDE {