Revert of gpu: GPU service scheduler.

gpu/ipc/client/gpu_channel_host.h

 // Copyright (c) 2012 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_CLIENT_GPU_CHANNEL_HOST_H_
 #define GPU_IPC_CLIENT_GPU_CHANNEL_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/atomic_sequence_num.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/process.h"
 #include "base/synchronization/lock.h"
 #include "gpu/config/gpu_info.h"
 #include "gpu/gpu_export.h"
+#include "gpu/ipc/common/gpu_stream_constants.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_sync_channel.h"
 #include "ipc/message_filter.h"
 #include "ipc/message_router.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/latency/latency_info.h"
 
 namespace base {
 class WaitableEvent;
 }
@@ skipping 109 matching lines @@
 
   // Reserve one unused transfer buffer ID.
   int32_t ReserveTransferBufferId();
 
   // Reserve one unused image ID.
   int32_t ReserveImageId();
 
   // Generate a route ID guaranteed to be unique for this channel.
   int32_t GenerateRouteID();
 
+  // Generate a stream ID guaranteed to be unique for this channel.
+  int32_t GenerateStreamID();
+
   // Sends a synchronous nop to the server which validate that all previous IPC
   // messages have been received. Once the synchronous nop has been sent to the
   // server all previous flushes will all be marked as validated, including
   // flushes for other streams on the same channel. Once a validation has been
   // sent, it will return the highest validated flush id for the stream.
   // If the validation fails (which can only happen upon context lost), the
   // highest validated flush id will not change. If no flush ID were ever
   // validated then it will return 0 (Note the lowest valid flush ID is 1).
   uint32_t ValidateFlushIDReachedServer(int32_t stream_id, bool force_validate);
 
@@ skipping 77 matching lines @@
   ~GpuChannelHost() override;
   void Connect(const IPC::ChannelHandle& channel_handle,
                base::WaitableEvent* shutdown_event);
   bool InternalSend(IPC::Message* msg);
   void InternalFlush(StreamFlushInfo* flush_info);
 
   // Threading notes: all fields are constant during the lifetime of |this|
   // except:
   // - |next_image_id_|, atomic type
   // - |next_route_id_|, atomic type
+  // - |next_stream_id_|, atomic type
   // - |channel_| and |stream_flush_info_|, protected by |context_lock_|
   GpuChannelHostFactory* const factory_;
 
   const int channel_id_;
   const gpu::GPUInfo gpu_info_;
 
   scoped_refptr<MessageFilter> channel_filter_;
 
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
 
   // A filter for sending messages from thread other than the main thread.
   scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
 
   // Image IDs are allocated in sequence.
   base::AtomicSequenceNumber next_image_id_;
 
   // Route IDs are allocated in sequence.
   base::AtomicSequenceNumber next_route_id_;
 
+  // Stream IDs are allocated in sequence.
+  base::AtomicSequenceNumber next_stream_id_;
+
   // Protects channel_ and stream_flush_info_.
   mutable base::Lock context_lock_;
   std::unique_ptr<IPC::SyncChannel> channel_;
   base::hash_map<int32_t, StreamFlushInfo> stream_flush_info_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelHost);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_CLIENT_GPU_CHANNEL_HOST_H_