[tracing] Send unique tracing process id for cross-process memory dumps identification.

content/browser/renderer_host/pepper/browser_ppapi_host_impl.cc

 // 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.
 
 #include "content/browser/renderer_host/pepper/browser_ppapi_host_impl.h"
 
 #include "base/metrics/sparse_histogram.h"
 #include "content/browser/renderer_host/pepper/pepper_message_filter.h"
 #include "content/browser/tracing/trace_message_filter.h"
 #include "content/common/pepper_renderer_instance_data.h"
@@ skipping 21 matching lines @@
                                profile_directory,
                                false /* in_process */,
                                true /* external_plugin */);
   browser_ppapi_host->set_plugin_process(
       base::Process::DeprecatedGetProcessFromHandle(plugin_child_process));
 
   scoped_refptr<PepperMessageFilter> pepper_message_filter(
       new PepperMessageFilter());
   channel->AddFilter(pepper_message_filter->GetFilter());
   channel->AddFilter(browser_ppapi_host->message_filter().get());
-  channel->AddFilter((new TraceMessageFilter())->GetFilter());
+  channel->AddFilter((new TraceMessageFilter(render_process_id))->GetFilter());
 
   return browser_ppapi_host;
 }
 
 BrowserPpapiHostImpl::BrowserPpapiHostImpl(
     IPC::Sender* sender,
     const ppapi::PpapiPermissions& permissions,
     const std::string& plugin_name,
     const base::FilePath& plugin_path,
     const base::FilePath& profile_data_directory,
@@ skipping 211 matching lines @@
         instance->second->renderer_data.render_frame_id;
     instance_data[i].document_url =
         instance->second->renderer_data.document_url;
     ++instance;
     ++i;
   }
   on_keepalive_callback_.Run(instance_data, profile_data_directory_);
 }
 
 }  // namespace content