gpu: Add SequenceId for identifying sync point sequences.

gpu/ipc/service/gpu_channel_manager.h

Index: gpu/ipc/service/gpu_channel_manager.h
diff --git a/gpu/ipc/service/gpu_channel_manager.h b/gpu/ipc/service/gpu_channel_manager.h
index 01301b2708c77d94b158a654db3bcd5464ba9bf6..5521287877c337bb7177b53be0fe011183091571 100644
--- a/gpu/ipc/service/gpu_channel_manager.h
+++ b/gpu/ipc/service/gpu_channel_manager.h
@@ -119,14 +119,6 @@ class GPU_EXPORT GpuChannelManager {
     return gpu_memory_buffer_factory_;
   }
 
-  // Returns the maximum order number for unprocessed IPC messages across all
-  // channels.
-  uint32_t GetUnprocessedOrderNum() const;
-
-  // Returns the maximum order number for processed IPC messages across all
-  // channels.
-  uint32_t GetProcessedOrderNum() const;
-
 #if defined(OS_ANDROID)
   void DidAccessGpu();
 #endif