cros_healthd: add is_chrome field

Chrome is trying to communicate with the cros_healthd
daemon via D-Bus. cros_healthd's method which Chrome calls
has changed to include an additional argument. Add this
argument to the MethodCall sent to cros_healthd.

/var/log/chrome/chrome for StatusUploader messages

Bug: b:128683357
Test: chery-pick crrev.com/c/1779132 and check
Change-Id: I477c466927f110ce5667034c00b48b8b2c830d8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912643Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Paul Moy <pmoy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716033}

chromeos/dbus/cros_healthd/cros_healthd_client.cc

@@ -56,6 +56,7 @@ class CrosHealthdClientImpl : public CrosHealthdClient {
     base::ScopedFD fd =
         platform_channel.TakeRemoteEndpoint().TakePlatformHandle().TakeFD();
     writer.AppendFileDescriptor(fd.get());
+    writer.AppendBool(/*is_chrome=*/true);
     cros_healthd_service_proxy_->CallMethod(
         &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
         base::BindOnce(