Use shared shared URLRequestContextGetter for all gcd_private sessions

chrome/browser/extensions/api/gcd_private/privet_v3_context_getter.h

 // Copyright 2015 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 CHROME_BROWSER_EXTENSIONS_API_GCD_PRIVATE_PRIVET_V3_CONTEXT_GETTER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_GCD_PRIVATE_PRIVET_V3_CONTEXT_GETTER_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace net {
 class CertVerifier;
 class URLRequestContext;
 struct SHA256HashValue;
 }
 
 namespace extensions {
 
 class PrivetV3ContextGetter : public net::URLRequestContextGetter {
  public:
   PrivetV3ContextGetter(
-      const scoped_refptr<base::SingleThreadTaskRunner>& net_task_runner,
-      const net::SHA256HashValue& certificate_fingerprint);
+      const scoped_refptr<base::SingleThreadTaskRunner>& net_task_runner);
 
   net::URLRequestContext* GetURLRequestContext() override;
 
   scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
       const override;
 
+  void AddPairedHost(const std::string& host,
+                     const net::SHA256HashValue& certificate_fingerprint,
+                     const base::Closure& callback);
+
  protected:
   ~PrivetV3ContextGetter() override;
 
  private:
-  scoped_ptr<net::CertVerifier> verifier_;
+  class CertVerifier;
+
+  void InitOnNetThread();
+  void AddPairedHostOnNetThread(
+      const std::string& host,
+      const net::SHA256HashValue& certificate_fingerprint);
+
+  // Owned by context_
+  CertVerifier* cert_verifier_ = nullptr;
   scoped_ptr<net::URLRequestContext> context_;
+
   scoped_refptr<base::SingleThreadTaskRunner> net_task_runner_;
 
+  base::WeakPtrFactory<PrivetV3ContextGetter> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(PrivetV3ContextGetter);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_GCD_PRIVATE_PRIVET_V3_CONTEXT_GETTER_H_