Makes it so we don't start watchdog when running under debugger

chrome/browser/chrome_browser_main.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 "chrome/browser/chrome_browser_main.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 1065 matching lines @@
 
 int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   TRACE_EVENT0("startup", "ChromeBrowserMainParts::PreMainMessageLoopRunImpl");
   // Android updates the metrics service dynamically depending on whether the
   // application is in the foreground or not. Do not start here.
 #if !defined(OS_ANDROID)
   // Now that the file thread has been started, start recording.
   StartMetricsRecording();
 #endif
 
-  // Create watchdog thread after creating all other threads because it will
-  // watch the other threads and they must be running.
-  browser_process_->watchdog_thread();
+  if (!base::debug::BeingDebugged()) {
+    // Create watchdog thread after creating all other threads because it will
+    // watch the other threads and they must be running.
+    browser_process_->watchdog_thread();
+  }
 
   // Do any initializating in the browser process that requires all threads
   // running.
   browser_process_->PreMainMessageLoopRun();
 
   // Record last shutdown time into a histogram.
   browser_shutdown::ReadLastShutdownInfo();
 
 #if defined(OS_WIN)
   // On Windows, we use our startup as an opportunity to do upgrade/uninstall
@@ skipping 582 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif
 #endif
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }