ozone: Add overlay candidate implementation that queries support via IPC

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

 // Copyright 2014 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.
 
 #ifndef UI_OZONE_PLATFORM_DRM_GPU_DRM_WINDOW_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_DRM_WINDOW_H_
 
 #include <vector>
 
 #include "base/timer/timer.h"
@@ skipping 66 matching lines @@
   // Move the HW cursor to the specified location.
   void MoveCursor(const gfx::Point& location);
 
   // Queue overlay planes and page flips.
   // If hardware display controller is available, forward the information
   // immediately, otherwise queue up on the window and forward when the hardware
   // is once again ready.
   void QueueOverlayPlane(const OverlayPlane& plane);
 
   bool SchedulePageFlip(bool is_sync, const SwapCompletionCallback& callback);
+  bool TestPageFlip(const OverlayPlaneList& planes);
 
   // Returns the last buffer associated with this window.
   const OverlayPlane* GetLastModesetBuffer();
 
  private:
   // Draw the last set cursor & update the cursor plane.
   void ResetCursor(bool bitmap_only);
 
   // Draw next frame in an animated cursor.
   void OnCursorAnimationTimeout();
@@ skipping 29 matching lines @@
   OverlayPlaneList pending_planes_;
   OverlayPlaneList last_submitted_planes_;
   bool last_swap_sync_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmWindow);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_WINDOW_H_