Wire up session_manager's SetFeatureFlagsForUser.

This is the usual boilerplate in SessionManagerClient and friends to
expose the new function.

BUG=chromium:1073940
TEST=None

Change-Id: Id9144ac921d8ab5f26f0874da9476838a3ebef5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560271
Commit-Queue: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840313}

chromeos/dbus/session_manager/fake_session_manager_client.cc

@@ -591,6 +591,10 @@ void FakeSessionManagerClient::SetFlagsForUser(
   flags_for_user_[cryptohome_id] = flags;
 }
 
+void FakeSessionManagerClient::SetFeatureFlagsForUser(
+    const cryptohome::AccountIdentifier& cryptohome_id,
+    const std::vector<std::string>& feature_flags) {}
+
 void FakeSessionManagerClient::GetServerBackedStateKeys(
     StateKeysCallback callback) {
   if (force_state_keys_missing_) {

chromeos/dbus/session_manager/fake_session_manager_client.h

@@ -117,6 +117,9 @@ class COMPONENT_EXPORT(SESSION_MANAGER) FakeSessionManagerClient
   bool SupportsBrowserRestart() const override;
   void SetFlagsForUser(const cryptohome::AccountIdentifier& cryptohome_id,
                        const std::vector<std::string>& flags) override;
+  void SetFeatureFlagsForUser(
+      const cryptohome::AccountIdentifier& cryptohome_id,
+      const std::vector<std::string>& feature_flags) override;
   void GetServerBackedStateKeys(StateKeysCallback callback) override;
 
   void StartArcMiniContainer(

chromeos/dbus/session_manager/session_manager_client.cc

@@ -517,6 +517,20 @@ class SessionManagerClientImpl : public SessionManagerClient {
                                        base::DoNothing());
   }
 
+  void SetFeatureFlagsForUser(
+      const cryptohome::AccountIdentifier& cryptohome_id,
+      const std::vector<std::string>& feature_flags) override {
+    dbus::MethodCall method_call(
+        login_manager::kSessionManagerInterface,
+        login_manager::kSessionManagerSetFeatureFlagsForUser);
+    dbus::MessageWriter writer(&method_call);
+    writer.AppendString(cryptohome_id.account_id());
+    writer.AppendArrayOfStrings(feature_flags);
+    session_manager_proxy_->CallMethod(&method_call,
+                                       dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+                                       base::DoNothing());
+  }
+
   void GetServerBackedStateKeys(StateKeysCallback callback) override {
     dbus::MethodCall method_call(
         login_manager::kSessionManagerInterface,

chromeos/dbus/session_manager/session_manager_client.h

@@ -372,6 +372,12 @@ class COMPONENT_EXPORT(SESSION_MANAGER) SessionManagerClient {
       const cryptohome::AccountIdentifier& cryptohome_id,
       const std::vector<std::string>& flags) = 0;
 
+  // Sets feature flags to pass next time Chrome gets restarted by the session
+  // manager.
+  virtual void SetFeatureFlagsForUser(
+      const cryptohome::AccountIdentifier& cryptohome_id,
+      const std::vector<std::string>& feature_flags) = 0;
+
   using StateKeysCallback =
       base::OnceCallback<void(const std::vector<std::string>& state_keys)>;