Add UpdateMountCredentials SmbProviderClient

- Adds UpdateMountCredentials to SmbProviderClient.
- This function will interact with Dbus to call CrOS's
  SmbProvider::UpdateMountCredentials.
- Updated FakeSmbProviderClient.

Bug: chromium:913691
Test: emerges
Change-Id: I6311bc0d38282dacd659f82348189f96d29526bb
Reviewed-on: https://chromium-review.googlesource.com/c/1388029Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619852}

chromeos/dbus/fake_smb_provider_client.cc

@@ -259,6 +259,15 @@ void FakeSmbProviderClient::ContinueReadDirectory(
       base::BindOnce(std::move(callback), smbprovider::ERROR_OK, entry_list));
 }
 
+void FakeSmbProviderClient::UpdateMountCredentials(int32_t mount_id,
+                                                   std::string workgroup,
+                                                   std::string username,
+                                                   base::ScopedFD password_fd,
+                                                   StatusCallback callback) {
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::BindOnce(std::move(callback), smbprovider::ERROR_OK));
+}
+
 void FakeSmbProviderClient::ClearShares() {
   shares_.clear();
 }

chromeos/dbus/fake_smb_provider_client.h

@@ -130,6 +130,12 @@ class CHROMEOS_EXPORT FakeSmbProviderClient : public SmbProviderClient {
                              int32_t read_dir_token,
                              ReadDirectoryCallback callback) override;
 
+  void UpdateMountCredentials(int32_t mount_id,
+                              std::string workgroup,
+                              std::string username,
+                              base::ScopedFD password_fd,
+                              StatusCallback callback) override;
+
   // Adds |share| to the list of shares for |server_url| in |shares_|.
   void AddToShares(const std::string& server_url, const std::string& share);
 

chromeos/dbus/smb_provider_client.cc

@@ -360,6 +360,25 @@ class SmbProviderClientImpl : public SmbProviderClient {
                &callback);
   }
 
+  void UpdateMountCredentials(int32_t mount_id,
+                              std::string workgroup,
+                              std::string username,
+                              base::ScopedFD password_fd,
+                              StatusCallback callback) override {
+    smbprovider::UpdateMountCredentialsOptionsProto options;
+    options.set_mount_id(mount_id);
+    options.set_workgroup(workgroup);
+    options.set_username(username);
+
+    dbus::MethodCall method_call(smbprovider::kSmbProviderInterface,
+                                 smbprovider::kUpdateMountCredentialsMethod);
+    dbus::MessageWriter writer(&method_call);
+    writer.AppendProtoAsArrayOfBytes(options);
+    writer.AppendFileDescriptor(password_fd.get());
+
+    CallDefaultMethod(&method_call, &callback);
+  }
+
  protected:
   // DBusClient override.
   void Init(dbus::Bus* bus) override {

chromeos/dbus/smb_provider_client.h

@@ -231,6 +231,16 @@ class CHROMEOS_EXPORT SmbProviderClient
                                      int32_t read_dir_token,
                                      ReadDirectoryCallback callback) = 0;
 
+  // Calls UpdateMountCredentials. This will update a mount's credentials with
+  // |workgroup|, |username|, and |password_fd|. Returns smbprovider::ERROR_OK
+  // if the mount's credentials successfully updated. Returns
+  // smbprovider::ERROR_NOT_FOUND if the mount's credentials were not updated.
+  virtual void UpdateMountCredentials(int32_t mount_id,
+                                      std::string workgroup,
+                                      std::string username,
+                                      base::ScopedFD password_fd,
+                                      StatusCallback callback) = 0;
+
  protected:
   // Create() should be used instead.
   SmbProviderClient();