Revert of gpu: GPU service scheduler.

gpu/ipc/common/gpu_stream_constants.h

Index: gpu/ipc/common/gpu_stream_constants.h
diff --git a/gpu/ipc/common/gpu_stream_constants.h b/gpu/ipc/common/gpu_stream_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..abab39895328ca4a1b09e0726aed23fc02e913d4
--- /dev/null
+++ b/gpu/ipc/common/gpu_stream_constants.h
@@ -0,0 +1,16 @@
+// Copyright 2015 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 GPU_IPC_COMMON_GPU_STREAM_CONSTANTS_H_
+#define GPU_IPC_COMMON_GPU_STREAM_CONSTANTS_H_
+
+namespace gpu {
+
+enum class GpuStreamPriority { REAL_TIME, HIGH, NORMAL, LOW, LAST = LOW };
+
+enum GpuStreamId { GPU_STREAM_DEFAULT = -1, GPU_STREAM_INVALID = 0 };
+
+}  // namespace gpu
+
+#endif  // GPU_IPC_COMMON_GPU_STREAM_CONSTANTS_H_