Add support for Blimp engine metrics reporting in development.

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index 12512d561f1b5fc69bb1e1c3f6d650502942e399..49983d4053af5d2c34e3749898c6220c4d783386 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -853,8 +853,16 @@ void BrowserProcessImpl::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterStringPref(prefs::kHardwareKeyboardLayout,
                                std::string());
 #endif  // defined(OS_CHROMEOS)
+
+#if defined(ENABLE_REPORTING_BLIMP)
+  // Enables reporting for the (headless) blimp engine. Defined in
+  // components/metrics/BUILD.gn
+  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);