Add ARC feature flag for Chrome OS

Add the ArcBootCompletedBroadcast feature flag to those exposed to
chromeos. This is needed by arcvm-launch to determine what commandline
parameters should be passed to the Android kernel.

BUG=b:136128691
TEST=dbus-send

Change-Id: I748b33ace2bab84c79075c9ee920e35bd7b56ff1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715398Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Chris Morin <cmtm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680187}

chrome/browser/chromeos/dbus/chrome_features_service_provider.cc

@@ -107,9 +107,13 @@ void ChromeFeaturesServiceProvider::IsFeatureEnabled(
     dbus::MethodCall* method_call,
     dbus::ExportedObject::ResponseSender response_sender) {
   static const base::Feature constexpr* kFeatureLookup[] = {
-      &features::kUsbbouncer, &features::kUsbguard,
-      &arc::kNativeBridgeExperimentFeature, &arc::kFilePickerExperimentFeature,
-      &arc::kCustomTabsExperimentFeature, &arc::kPrintSpoolerExperimentFeature,
+      &features::kUsbbouncer,
+      &features::kUsbguard,
+      &arc::kBootCompletedBroadcastFeature,
+      &arc::kCustomTabsExperimentFeature,
+      &arc::kFilePickerExperimentFeature,
+      &arc::kNativeBridgeExperimentFeature,
+      &arc::kPrintSpoolerExperimentFeature,
   };
 
   dbus::MessageReader reader(method_call);