[GCM] Reland: Introduce GCMClientFactory to create GCMClient for GCMProfileService

google_apis/gcm/gcm_client_impl.h

 // Copyright 2013 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_GCM_GCM_CLIENT_IMPL_H_
 #define GOOGLE_APIS_GCM_GCM_CLIENT_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "google_apis/gcm/gcm_client.h"
 
 namespace base {
 class FilePath;
 class SequencedTaskRunner;
 }  // namespace base
 
 namespace gcm {
 
 class GCMStore;
 class UserList;
 
-class GCMClientImpl : public GCMClient {
+class GCM_EXPORT GCMClientImpl : public GCMClient {
  public:
   GCMClientImpl();
   virtual ~GCMClientImpl();
 
   void Initialize(
       const base::FilePath& path,
       scoped_refptr<base::SequencedTaskRunner> blocking_task_runner);
 
   // Overridden from GCMClient:
   virtual void SetUserDelegate(const std::string& username,
@@ skipping 14 matching lines @@
  private:
   scoped_ptr<GCMStore> gcm_store_;
   scoped_ptr<UserList> user_list_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMClientImpl);
 };
 
 }  // namespace gcm
 
 #endif  // GOOGLE_APIS_GCM_GCM_CLIENT_IMPL_H_