ozone: Add overlay candidate implementation that queries support via IPC

ui/ozone/platform/drm/host/drm_overlay_manager.h

Index: ui/ozone/platform/drm/host/drm_overlay_manager.h
diff --git a/ui/ozone/platform/drm/host/drm_overlay_manager.h b/ui/ozone/platform/drm/host/drm_overlay_manager.h
index e02ee30081cd2bd0ed56aec1e7f26e724e437488..b98a81351112f77238d828d38a0f060e9a9d7884 100644
--- a/ui/ozone/platform/drm/host/drm_overlay_manager.h
+++ b/ui/ozone/platform/drm/host/drm_overlay_manager.h
@@ -10,9 +10,12 @@
 
 namespace ui {
 
+class DrmGpuPlatformSupportHost;
+
 class DrmOverlayManager : public OverlayManagerOzone {
  public:
-  DrmOverlayManager(bool allow_surfaceless);
+  DrmOverlayManager(bool allow_surfaceless,
+                    DrmGpuPlatformSupportHost* platform_support_host);
   ~DrmOverlayManager() override;
 
   // OverlayManagerOzone:
@@ -21,9 +24,9 @@ class DrmOverlayManager : public OverlayManagerOzone {
   bool CanShowPrimaryPlaneAsOverlay() override;
 
  private:
+  DrmGpuPlatformSupportHost* platform_support_host_;
   bool allow_surfaceless_;
-
-  scoped_ptr<OverlayCandidatesOzone> candidates_;
+  bool is_supported_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmOverlayManager);
 };