Stats for the renderers are all broken, because of this change:...

chrome/app/chrome_dll_main.cc

 // Copyright (c) 2006-2008 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.
 
 // TODO(port): the ifdefs in here are a first step towards trying to determine
 // the correct abstraction for all the OS functionality required at this
 // stage of process initialization. It should not be taken as a final
 // abstraction.
 
 #include "build/build_config.h"
@@ skipping 248 matching lines @@
   CommandLine::Init(argc, argv);
 #endif
   const CommandLine& parsed_command_line = *CommandLine::ForCurrentProcess();
 
 #if defined(OS_WIN)
    // Must do this before any other usage of command line!
   if (::IncorrectChromeHtmlArguments(parsed_command_line.command_line_string()))
     return 1;
 #endif
 
+  int browser_pid;
+  std::wstring process_type =
+    parsed_command_line.GetSwitchValue(switches::kProcessType);
+  if (process_type.empty()) {
+    browser_pid = base::GetCurrentProcId();
+  } else {
+    std::wstring channel_name =
+      parsed_command_line.GetSwitchValue(switches::kProcessChannelID);
+
+    browser_pid = _wtoi(channel_name.c_str());
+    DCHECK(browser_pid != 0);
+  }
   SetupCRT(parsed_command_line);
 
   // Initialize the Chrome path provider.
   chrome::RegisterPathProvider();
 
   // Initialize the Stats Counters table.  With this initialized,
   // the StatsViewer can be utilized to read counters outside of
   // Chrome.  These lines can be commented out to effectively turn
   // counters 'off'.  The table is created and exists for the life
   // of the process.  It is not cleaned up.
   // TODO(port): we probably need to shut this down correctly to avoid
   // leaking shared memory regions on posix platforms.
   std::string statsfile = chrome::kStatsFilename;
-  std::string pid_string = StringPrintf("-%d", base::GetCurrentProcId());
+  std::string pid_string = StringPrintf("-%d", browser_pid);
   statsfile += pid_string;
   StatsTable *stats_table = new StatsTable(statsfile,
       chrome::kStatsMaxThreads, chrome::kStatsMaxCounters);
   StatsTable::set_current(stats_table);
 
   StatsScope<StatsCounterTimer>
       startup_timer(chrome::Counters::chrome_main());
 
   // Enable the heap profiler as early as possible!
   EnableHeapProfiler(parsed_command_line);
 
   // Enable Message Loop related state asap.
   if (parsed_command_line.HasSwitch(switches::kMessageLoopHistogrammer))
     MessageLoop::EnableHistogrammer(true);
 
-  std::wstring process_type =
-    parsed_command_line.GetSwitchValue(switches::kProcessType);
-
   // Checks if the sandbox is enabled in this process and initializes it if this
   // is the case. The crash handler depends on this so it has to be done before
   // its initialization.
   SandboxInitWrapper sandbox_wrapper;
 #if defined(OS_WIN)
   sandbox_wrapper.SetServices(sandbox_info);
 #endif
   sandbox_wrapper.InitializeSandbox(parsed_command_line, process_type);
 
 #if defined(OS_WIN)
@@ skipping 73 matching lines @@
 
   _Module.Term();
 #endif
 
   logging::CleanupChromeLogging();
 
   return rv;
 }