gpu: Add SequenceId for identifying sync point sequences.

gpu/command_buffer/tests/gl_manager.h

Index: gpu/command_buffer/tests/gl_manager.h
diff --git a/gpu/command_buffer/tests/gl_manager.h b/gpu/command_buffer/tests/gl_manager.h
index 073b56a1435366a549e7dbdb87d537b986b2f944..ad0b70db6f388a3f404338b6c9511a75587c9a0a 100644
--- a/gpu/command_buffer/tests/gl_manager.h
+++ b/gpu/command_buffer/tests/gl_manager.h
@@ -35,7 +35,7 @@ namespace gpu {
 class CommandBufferService;
 class CommandExecutor;
 class ImageFactory;
-class SyncPointClient;
+class SyncPointClientState;
 class SyncPointOrderData;
 class SyncPointManager;
 class TransferBuffer;
@@ -161,7 +161,7 @@ class GLManager : private GpuControl {
   SyncPointManager* sync_point_manager_ = nullptr;  // Non-owning.
 
   scoped_refptr<SyncPointOrderData> sync_point_order_data_;
-  std::unique_ptr<SyncPointClient> sync_point_client_;
+  scoped_refptr<SyncPointClientState> sync_point_client_state_;
   scoped_refptr<gles2::MailboxManager> mailbox_manager_;
   scoped_refptr<gl::GLShareGroup> share_group_;
   std::unique_ptr<CommandBufferService> command_buffer_;