ozone: Add overlay candidate implementation that queries support via IPC

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

 // 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.
 
 #include "ui/ozone/platform/drm/gpu/drm_window.h"
 
 #include "base/trace_event/trace_event.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkDevice.h"
 #include "third_party/skia/include/core/SkSurface.h"
@@ skipping 117 matching lines @@
 
   if (controller_) {
     return controller_->SchedulePageFlip(last_submitted_planes_, is_sync, false,
                                          callback);
   }
 
   callback.Run();
   return true;
 }
 
+bool DrmWindow::TestPageFlip(const OverlayPlaneList& planes) {
+  return controller_ &&
+         controller_->SchedulePageFlip(last_submitted_planes_, true, true,
+                                       base::Bind(&base::DoNothing));
+}
+
 const OverlayPlane* DrmWindow::GetLastModesetBuffer() {
   return OverlayPlane::GetPrimaryPlane(last_submitted_planes_);
 }
 
 void DrmWindow::ResetCursor(bool bitmap_only) {
   if (!controller_)
     return;
 
   if (cursor_bitmaps_.size()) {
     // Draw new cursor into backbuffer.
@@ skipping 53 matching lines @@
       if (!cursor_buffers_[i]->Initialize(
               info, false /* should_register_framebuffer */)) {
         LOG(FATAL) << "Failed to initialize cursor buffer";
         return;
       }
     }
   }
 }
 
 }  // namespace ui