Revert of memory-infra: Finish moving to Mojo (2nd attempt)

content/public/common/child_process_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 CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_
 
 #include <stdint.h>
 
 #include "base/files/scoped_file.h"
@@ skipping 22 matching lines @@
 // processes like plugins, or an embedder could even use this for long lived
 // processes that run independent of the browser process.
 class CONTENT_EXPORT ChildProcessHost : public IPC::Sender {
  public:
   ~ChildProcessHost() override {}
 
   // This is a value never returned as the unique id of any child processes of
   // any kind, including the values returned by RenderProcessHost::GetID().
   static int kInvalidUniqueID;
 
+  // This value is used as the tracing id of the browser process for identifying
+  // cross-process shared memory segments when tracing.
+  // Note: In single-process mode all the clients of tracing will use this id.
+  static uint64_t kBrowserTracingProcessId;
+
   // Used to create a child process host. The delegate must outlive this object.
   static ChildProcessHost* Create(ChildProcessHostDelegate* delegate);
 
   // These flags may be passed to GetChildPath in order to alter its behavior,
   // causing it to return a child path more suited to a specific task.
   enum {
     // No special behavior requested.
     CHILD_NORMAL = 0,
 
 #if defined(OS_LINUX)
@@ skipping 43 matching lines @@
 
   // Returns the service_manager::InterfaceProvider the process host can use to
   // bind
   // interfaces exposed to it from the child.
   virtual service_manager::InterfaceProvider* GetRemoteInterfaces() = 0;
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_