Refactor AO2TS to make it easier to componentize.

google_apis/gaia/oauth2_token_service_delegate.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/profiler/scoped_tracker.h"
+#include "google_apis/gaia/oauth2_token_service.h"
+#include "google_apis/gaia/oauth2_token_service_delegate.h"
+
+OAuth2TokenServiceDelegate::ScopedBatchChange::ScopedBatchChange(
+    OAuth2TokenServiceDelegate* delegate)
+    : delegate_(delegate) {
+  DCHECK(delegate_);
+  delegate_->StartBatchChanges();
+}
+
+OAuth2TokenServiceDelegate::ScopedBatchChange::~ScopedBatchChange() {
+  delegate_->EndBatchChanges();
+}
+
+OAuth2TokenServiceDelegate::OAuth2TokenServiceDelegate()
+    : batch_change_depth_(0) {
+}
+
+OAuth2TokenServiceDelegate::~OAuth2TokenServiceDelegate() {
+}
+
+void OAuth2TokenServiceDelegate::AddObserver(
+    OAuth2TokenService::Observer* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void OAuth2TokenServiceDelegate::RemoveObserver(
+    OAuth2TokenService::Observer* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
+void OAuth2TokenServiceDelegate::StartBatchChanges() {
+  ++batch_change_depth_;
+  if (batch_change_depth_ == 1)
+    FOR_EACH_OBSERVER(OAuth2TokenService::Observer, observer_list_,
+                      OnStartBatchChanges());
+}
+
+void OAuth2TokenServiceDelegate::EndBatchChanges() {
+  --batch_change_depth_;
+  DCHECK_LE(0, batch_change_depth_);
+  if (batch_change_depth_ == 0)
+    FOR_EACH_OBSERVER(OAuth2TokenService::Observer, observer_list_,
+                      OnEndBatchChanges());
+}
+
+void OAuth2TokenServiceDelegate::FireRefreshTokenAvailable(
+    const std::string& account_id) {
+  // TODO(robliao): Remove ScopedTracker below once https://crbug.com/422460 is
+  // fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 OAuth2TokenService::FireRefreshTokenAvailable"));
+
+  FOR_EACH_OBSERVER(OAuth2TokenService::Observer, observer_list_,
+                    OnRefreshTokenAvailable(account_id));
+}
+
+void OAuth2TokenServiceDelegate::FireRefreshTokenRevoked(
+    const std::string& account_id) {
+  FOR_EACH_OBSERVER(OAuth2TokenService::Observer, observer_list_,
+                    OnRefreshTokenRevoked(account_id));
+}
+
+void OAuth2TokenServiceDelegate::FireRefreshTokensLoaded() {
+  // TODO(robliao): Remove ScopedTracker below once https://crbug.com/422460 is
+  // fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 OAuth2TokenService::FireRefreshTokensLoaded"));
+
+  FOR_EACH_OBSERVER(OAuth2TokenService::Observer, observer_list_,
+                    OnRefreshTokensLoaded());
+}
+
+net::URLRequestContextGetter* OAuth2TokenServiceDelegate::GetRequestContext()
+    const {
+  NOTREACHED();
+  return nullptr;
+}