Windows Breakpad: Allow the crash dump dir and pipe name to be overridden

chrome/app/breakpad_win.cc

 // Copyright (c) 2011 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 "chrome/app/breakpad_win.h"
 
 #include <windows.h>
 #include <shellapi.h>
 #include <tchar.h>
 
@@ skipping 501 matching lines @@
   bool use_crash_service = !controlled_by_policy &&
       ((command.HasSwitch(switches::kNoErrorDialogs) ||
       GetEnvironmentVariable(
           ASCIIToWide(env_vars::kHeadless).c_str(), NULL, 0)));
   bool is_per_user_install =
       InstallUtil::IsPerUserInstall(info->dll_path.c_str());
 
   std::wstring pipe_name;
   if (use_crash_service) {
     // Crash reporting is done by crash_service.exe.
-    pipe_name = kChromePipeName;
+    const wchar_t* var_name = L"CHROME_BREAKPAD_PIPE_NAME";
+    DWORD value_length = ::GetEnvironmentVariableW(var_name, NULL, 0);
+    if (value_length == 0) {
+      pipe_name = kChromePipeName;
+    } else {
+      scoped_array<wchar_t> value(new wchar_t[value_length]);
+      ::GetEnvironmentVariableW(var_name, value.get(), value_length);
+      pipe_name = value.get();
+    }
   } else {
     // We want to use the Google Update crash reporting. We need to check if the
     // user allows it first (in case the administrator didn't already decide
     // via policy).
     if (!controlled_by_policy)
       crash_reporting_enabled = GoogleUpdateSettings::GetCollectStatsConsent();
 
     if (!crash_reporting_enabled) {
       // Configuration managed or the user did not allow Google Update to send
       // crashes, we need to use our default crash handler instead, but only
@@ skipping 88 matching lines @@
       if (QueueUserWorkItem(
               &InitCrashReporterThread,
               info,
               WT_EXECUTELONGFUNCTION) == 0) {
         // We failed to queue to the worker pool, initialize in this thread.
         InitCrashReporterThread(info);
       }
     }
   }
 }