Add WilcoDtc feature flag

Start WilcoDtcSupportdManager only if WilcoDtc feature is set.

BUG=b:123926541
TEST=local device

Change-Id: I3caab04b1445c43b8a32e4a8ef1bfbbaa357b871
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1604275
Commit-Queue: Polina Bondarenko <pbond@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662563}

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

@@ -705,7 +705,8 @@ void ChromeBrowserMainPartsChromeos::PreProfileInit() {
 
   g_browser_process->platform_part()->InitializeChromeUserManager();
 
-  wilco_dtc_supportd_manager_ = std::make_unique<WilcoDtcSupportdManager>();
+  if (base::FeatureList::IsEnabled(::features::kWilcoDtc))
+    wilco_dtc_supportd_manager_ = std::make_unique<WilcoDtcSupportdManager>();
 
   ScreenLocker::InitClass();
 

chrome/common/chrome_features.cc

@@ -201,6 +201,11 @@ const base::Feature kPluginVm{"PluginVm", base::FEATURE_DISABLED_BY_DEFAULT};
 // Whether the UsageTimeLimit policy should be applied to the user.
 const base::Feature kUsageTimeLimitPolicy{"UsageTimeLimitPolicy",
                                           base::FEATURE_ENABLED_BY_DEFAULT};
+
+// Allow a Wilco DTC (diagnostics and telemetry controller) on Chrome OS.
+// More info about the project may be found here:
+// https://docs.google.com/document/d/18Ijj8YlC8Q3EWRzLspIi2dGxg4vIBVe5sJgMPt9SWYo
+const base::Feature kWilcoDtc{"WilcoDtc", base::FEATURE_DISABLED_BY_DEFAULT};
 #endif
 
 // Enables or disables Desktop PWAs capturing links.

chrome/common/chrome_features.h

@@ -116,6 +116,7 @@ extern const base::Feature kCupsPrintersUiOverhaul;
 COMPONENT_EXPORT(CHROME_FEATURES) extern const base::Feature kPluginVm;
 COMPONENT_EXPORT(CHROME_FEATURES)
 extern const base::Feature kUsageTimeLimitPolicy;
+COMPONENT_EXPORT(CHROME_FEATURES) extern const base::Feature kWilcoDtc;
 #endif
 
 COMPONENT_EXPORT(CHROME_FEATURES)