ozone: Add overlay candidate implementation that queries support via IPC

ui/ozone/platform/drm/ozone_platform_gbm.cc

Index: ui/ozone/platform/drm/ozone_platform_gbm.cc
diff --git a/ui/ozone/platform/drm/ozone_platform_gbm.cc b/ui/ozone/platform/drm/ozone_platform_gbm.cc
index f045ec689b1f00b59c1eaf362c5778244f1055e2..8dc03654760e79f5dc5e8c305d6119aa7d4a593c 100644
--- a/ui/ozone/platform/drm/ozone_platform_gbm.cc
+++ b/ui/ozone/platform/drm/ozone_platform_gbm.cc
@@ -158,7 +158,8 @@ class OzonePlatformGbm : public OzonePlatform {
     display_manager_.reset(new DrmDisplayHostManager(
         gpu_platform_support_host_.get(), device_manager_.get()));
     cursor_factory_ozone_.reset(new BitmapCursorFactoryOzone);
-    overlay_manager_.reset(new DrmOverlayManager(use_surfaceless_));
+    overlay_manager_.reset(new DrmOverlayManager(
+        use_surfaceless_, gpu_platform_support_host_.get()));
 #if defined(USE_XKBCOMMON)
     KeyboardLayoutEngineManager::SetKeyboardLayoutEngine(make_scoped_ptr(
         new XkbKeyboardLayoutEngine(xkb_evdev_code_converter_)));
@@ -184,7 +185,8 @@ class OzonePlatformGbm : public OzonePlatform {
     scoped_ptr<DrmGpuDisplayManager> ndd(new DrmGpuDisplayManager(
         screen_manager_.get(), drm_device_manager_.get()));
     gpu_platform_support_.reset(new DrmGpuPlatformSupport(
-        drm_device_manager_.get(), screen_manager_.get(), ndd.Pass()));
+        drm_device_manager_.get(), screen_manager_.get(),
+        buffer_generator_.get(), ndd.Pass()));
   }
 
  private: