[Ozone-GBM] Handle GPU crashes

ui/ozone/platform/dri/channel_observer.h

Index: ui/ozone/platform/dri/channel_observer.h
diff --git a/ui/ozone/platform/dri/channel_observer.h b/ui/ozone/platform/dri/channel_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..356a79ea9d42e4d55edb9a35bc9ff25930d60f03
--- /dev/null
+++ b/ui/ozone/platform/dri/channel_observer.h
@@ -0,0 +1,21 @@
+// 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_DRI_CHANNEL_OBSERVER_H_
+#define UI_OZONE_PLATFORM_DRI_CHANNEL_OBSERVER_H_
+
+namespace ui {
+
+// Observes the channel state.
+class ChannelObserver {
+ public:
+  virtual ~ChannelObserver() {}
+
+  virtual void OnChannelEstablished() = 0;
+  virtual void OnChannelDestroyed() = 0;
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRI_CHANNEL_OBSERVER_H_