Add browser-global GCMDriver

google_apis/gaia/dummy_identity_provider.h

Index: google_apis/gaia/dummy_identity_provider.h
diff --git a/google_apis/gaia/dummy_identity_provider.h b/google_apis/gaia/dummy_identity_provider.h
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+++ b/google_apis/gaia/dummy_identity_provider.h
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+// 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.
+
+#ifndef GOOGLE_APIS_GAIA_DUMMY_IDENTITY_PROVIDER_H_
+#define GOOGLE_APIS_GAIA_DUMMY_IDENTITY_PROVIDER_H_
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "google_apis/gaia/identity_provider.h"
+
+// GCMDriverDesktop depends on IdentityProvider as it was originally meant to
+// work for signed-in users only. This dependency is being removed. While it is
+// still present, DummyIdentityProvider will be used for the browser-global
+// GCMDriver instance. The DummyIdentityProvider never has any active user or
+// tokens.
+// TODO(bartfab,jianli): Remove this class when GCMDriverDesktop no longer
+// depends on IdentityService.
+class DummyIdentityProvider : public IdentityProvider {
+ public:
+  DummyIdentityProvider();
+  virtual ~DummyIdentityProvider();
+
+  // IdentityProvider:
+  virtual std::string GetActiveUsername() OVERRIDE;
+  virtual std::string GetActiveAccountId() OVERRIDE;
+  virtual OAuth2TokenService* GetTokenService() OVERRIDE;
+  virtual bool RequestLogin() OVERRIDE;
+
+ private:
+  class DummyOAuth2TokenService;
+
+  scoped_ptr<DummyOAuth2TokenService> oauth2_token_service_;
+
+  DISALLOW_COPY_AND_ASSIGN(DummyIdentityProvider);
+};
+
+#endif  // GOOGLE_APIS_GAIA_FAKE_IDENTITY_PROVIDER_H_