WIP GPU scheduler + delayed activation / tile draw

gpu/ipc/service/gpu_command_stream.h

Index: gpu/ipc/service/gpu_command_stream.h
diff --git a/gpu/ipc/service/gpu_command_stream.h b/gpu/ipc/service/gpu_command_stream.h
new file mode 100644
index 0000000000000000000000000000000000000000..0e687ede05cff38c8bbd8cf512c8b314baed45ec
--- /dev/null
+++ b/gpu/ipc/service/gpu_command_stream.h
@@ -0,0 +1,29 @@
+// Copyright (c) 2016 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_SERVICE_GPU_COMMAND_STREAM_H_
+#define GPU_IPC_SERVICE_GPU_COMMAND_STREAM_H_
+
+#include "gpu/gpu_export.h"
+#include "gpu/ipc/common/gpu_stream_constants.h"
+
+namespace gpu {
+
+// GpuCommandStream is a stream of commands from a client. Streams are
+// independent of each other and must synchronize / share resources explicitly.
+// GpuScheduler cooperatively schedules streams from multiple clients.
+class GPU_EXPORT GpuCommandStream {
+ public:
+  // Run commands in this stream. The stream should check
+  // GpuScheduler::ShouldYield periodically and yield accordingly. Called on
+  // main thread.
+  virtual void Run() = 0;
+
+ protected:
+  virtual ~GpuCommandStream() {}
+};
+
+}
+
+#endif  // GPU_IPC_SERVICE_GPU_COMMAND_STREAM_H_