Ozone: Dont hardcode format to YUV when using Overlay Composition.

ui/ozone/platform/drm/gpu/drm_window.h

Index: ui/ozone/platform/drm/gpu/drm_window.h
diff --git a/ui/ozone/platform/drm/gpu/drm_window.h b/ui/ozone/platform/drm/gpu/drm_window.h
index 629fbdcd7badd1721f9dac2c27560750c6ff9f2f..221c694e6ad3c983d2ab9053947ff51fa9b70102 100644
--- a/ui/ozone/platform/drm/gpu/drm_window.h
+++ b/ui/ozone/platform/drm/gpu/drm_window.h
@@ -30,6 +30,7 @@ namespace ui {
 class DrmBuffer;
 class DrmDevice;
 class DrmDeviceManager;
+class DrmOverlayCandidate;
 class HardwareDisplayController;
 struct OverlayCheck_Params;
 class ScanoutBufferGenerator;
@@ -87,7 +88,8 @@ class OZONE_EXPORT DrmWindow {
   void SchedulePageFlip(const std::vector<OverlayPlane>& planes,
                         const SwapCompletionCallback& callback);
   std::vector<OverlayCheck_Params> TestPageFlip(
-      const std::vector<OverlayCheck_Params>& planes,
+      const std::vector<OverlayCheck_Params>& current_combination,
+      const std::vector<OverlayCheck_Params>& new_combination,
       ScanoutBufferGenerator* buffer_generator);
 
   // Returns the last buffer associated with this window.
@@ -96,6 +98,11 @@ class OZONE_EXPORT DrmWindow {
   void GetVSyncParameters(
       const gfx::VSyncProvider::UpdateVSyncCallback& callback) const;
 
+  // Returns optimal buffer configuration for the expected OverlayCandidates
+  // which can be supported by the display on which this window is shown.
+  void GetOverlayBufferConfigurations(
+      const OverlayParamCallback& callback) const;
+
  private:
   // Draw the last set cursor & update the cursor plane.
   void ResetCursor(bool bitmap_only);
@@ -118,6 +125,7 @@ class OZONE_EXPORT DrmWindow {
   // The controller associated with the current window. This may be nullptr if
   // the window isn't over an active display.
   HardwareDisplayController* controller_ = nullptr;
+  scoped_ptr<DrmOverlayCandidate> overlay_validator_;
 
   base::RepeatingTimer cursor_timer_;