Ozone integration.

ui/ozone/platform/drm/gpu/drm_vsync_provider.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_vsync_provider.h"
+
+#include "base/time/time.h"
+#include "ui/ozone/platform/drm/gpu/drm_window.h"
+#include "ui/ozone/platform/drm/gpu/hardware_display_controller.h"
+
+namespace ui {
+
+DrmVSyncProvider::DrmVSyncProvider(DrmWindow* window_delegate)
+    : window_delegate_(window_delegate) {
+}
+
+DrmVSyncProvider::~DrmVSyncProvider() {
+}
+
+void DrmVSyncProvider::GetVSyncParameters(const UpdateVSyncCallback& callback) {
+  HardwareDisplayController* controller = window_delegate_->GetController();
+  if (!controller)
+    return;
+
+  // The value is invalid, so we can't update the parameters.
+  if (controller->GetTimeOfLastFlip() == 0 ||
+      controller->get_mode().vrefresh == 0)
+    return;
+
+  // Stores the time of the last refresh.
+  base::TimeTicks timebase =
+      base::TimeTicks::FromInternalValue(controller->GetTimeOfLastFlip());
+  // Stores the refresh rate.
+  base::TimeDelta interval =
+      base::TimeDelta::FromSeconds(1) / controller->get_mode().vrefresh;
+
+  callback.Run(timebase, interval);
+}
+
+}  // namespace ui