Add support in the network service for different contexts.

content/network/network_context.h

 // Copyright 2017 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 CONTENT_NETWORK_NETWORK_CONTEXT_H_
 #define CONTENT_NETWORK_NETWORK_CONTEXT_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <set>
 
 #include "base/macros.h"
 #include "content/common/content_export.h"
+#include "content/common/network_service.mojom.h"
+#include "content/common/url_loader_factory.mojom.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/strong_binding_set.h"
 
 namespace net {
 class URLRequestContext;
 }
 
 namespace content {
 class URLLoaderImpl;
 
-class CONTENT_EXPORT NetworkContext {
+class NetworkContext : public mojom::NetworkContext {
  public:
-  NetworkContext();
-  ~NetworkContext();
+  NetworkContext(mojom::NetworkContextRequest request,
+                 mojom::NetworkContextParamsPtr params);
+  ~NetworkContext() override;
+
+  CONTENT_EXPORT static std::unique_ptr<NetworkContext> CreateForTesting();
 
   net::URLRequestContext* url_request_context() {
     return url_request_context_.get();
   }
 
   // These are called by individual url loaders as they are being created and
   // destroyed.
   void RegisterURLLoader(URLLoaderImpl* url_loader);
   void DeregisterURLLoader(URLLoaderImpl* url_loader);
 
+  // mojom::NetworkContext implementation:
+  void CreateURLLoaderFactory(mojom::URLLoaderFactoryRequest request,
+                              uint32_t process_id) override;
+  void HandleViewCacheRequest(const GURL& url,
+                              mojom::URLLoaderClientPtr client) override;
+
  private:
-  class MojoNetLog;
-  std::unique_ptr<MojoNetLog> net_log_;
+  NetworkContext();
 
   std::unique_ptr<net::URLRequestContext> url_request_context_;
 
+  // Put it below |url_request_context_| so that it outlives all the
+  // NetworkServiceURLLoaderFactoryImpl instances.
+  mojo::StrongBindingSet<mojom::URLLoaderFactory> loader_factory_bindings_;
+
   // URLLoaderImpls register themselves with the NetworkContext so that they can
   // be cleaned up when the NetworkContext goes away. This is needed as
   // net::URLRequests held by URLLoaderImpls have to be gone when
   // net::URLRequestContext (held by NetworkContext) is destroyed.
   std::set<URLLoaderImpl*> url_loaders_;
 
   // Set when entering the destructor, in order to avoid manipulations of the
   // |url_loaders_| (as a url_loader might delete itself in Cleanup()).
   bool in_shutdown_;
 
+  mojom::NetworkContextParamsPtr params_;
+
+  mojo::Binding<mojom::NetworkContext> binding_;
+
   DISALLOW_COPY_AND_ASSIGN(NetworkContext);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_NETWORK_NETWORK_CONTEXT_H_