Add support for Blimp engine metrics reporting in development.

chrome/browser/browser_process_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 "chrome/browser/browser_process_impl.h"
 
 #include <stddef.h>
 #include <algorithm>
 #include <map>
 #include <utility>
@@ skipping 835 matching lines @@
   // a candidate for removal.
   // Initialize ResourceBundle which handles files loaded from external
   // sources. This has to be done before uninstall code path and before prefs
   // are registered.
   registry->RegisterStringPref(prefs::kApplicationLocale, std::string());
 #if defined(OS_CHROMEOS)
   registry->RegisterStringPref(prefs::kOwnerLocale, std::string());
   registry->RegisterStringPref(prefs::kHardwareKeyboardLayout,
                                std::string());
 #endif  // defined(OS_CHROMEOS)
+
+#if defined(ENABLE_REPORTING_HEADLESS)

[Alexei Svitkine (slow), 2016/03/07 20:38:25]

Please add a comment about what this is and point at the build file that defines
this.

[Jess, 2016/03/07 21:09:21]

Done. PTAL.

+  registry->RegisterBooleanPref(metrics::prefs::kMetricsReportingEnabled, true);
+#else
   registry->RegisterBooleanPref(metrics::prefs::kMetricsReportingEnabled,
                                 GoogleUpdateSettings::GetCollectStatsConsent());
+#endif // defined(ENABLE_REPORTING_HEADLESS)
+
 #if BUILDFLAG(ANDROID_JAVA_UI)
   registry->RegisterBooleanPref(
       prefs::kCrashReportingEnabled, false);
 #endif  // BUILDFLAG(ANDROID_JAVA_UI)
 }
 
 DownloadRequestLimiter* BrowserProcessImpl::download_request_limiter() {
   DCHECK(CalledOnValidThread());
   if (!download_request_limiter_.get())
     download_request_limiter_ = new DownloadRequestLimiter();
@@ skipping 435 matching lines @@
 }
 
 void BrowserProcessImpl::OnAutoupdateTimer() {
   if (CanAutorestartForUpdate()) {
     DLOG(WARNING) << "Detected update.  Restarting browser.";
     RestartBackgroundInstance();
   }
 }
 
 #endif  // (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)