Implement utility-side proxy resolver factory Mojo service.

net/proxy/mojo_proxy_resolver_factory_impl.cc

+// 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.
+
+#include "net/proxy/mojo_proxy_resolver_factory_impl.h"
+
+#include "net/dns/host_resolver_mojo.h"
+#include "net/proxy/mojo_proxy_resolver_impl.h"
+#include "net/proxy/proxy_resolver_v8.h"
+#include "net/proxy/proxy_resolver_v8_tracing.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/error_handler.h"
+
+namespace net {
+namespace {
+
+scoped_ptr<ProxyResolver> CreateDefaultProxyResolver(
+    HostResolver* host_resolver) {
+  ProxyResolverV8::EnsureIsolateCreated();

[eroman, 2015/02/25 00:31:18]

This should actually be moved elsewhere so it is just a party of
V8ProxyResolver's lazy initialization... I will work on it in a separate CL

+  return make_scoped_ptr(
+      new ProxyResolverV8Tracing(host_resolver, nullptr, nullptr));
+}
+
+// A class to manage the lifetime of a MojoProxyResolverImpl and a
+// HostResolverMojo. An instance will remain while the message pipes for both
+// mojo connections remain open.
+class MojoProxyResolverHolder : public mojo::ErrorHandler {
+ public:
+  MojoProxyResolverHolder(
+      const MojoProxyResolverFactoryImpl::Factory& proxy_resolver_factory,
+      mojo::InterfaceRequest<interfaces::ProxyResolver> request,
+      interfaces::HostResolverPtr host_resolver);
+
+ private:
+  // mojo::ErrorHandler override.
+  void OnConnectionError() override;
+
+  HostResolverMojo host_resolver_;
+  MojoProxyResolverImpl proxy_resolver_;
+  mojo::Binding<interfaces::ProxyResolver> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(MojoProxyResolverHolder);
+};
+
+MojoProxyResolverHolder::MojoProxyResolverHolder(
+    const MojoProxyResolverFactoryImpl::Factory& proxy_resolver_factory,
+    mojo::InterfaceRequest<interfaces::ProxyResolver> request,
+    interfaces::HostResolverPtr host_resolver)
+    : host_resolver_(host_resolver.Pass(),
+                     base::Bind(&MojoProxyResolverHolder::OnConnectionError,
+                                base::Unretained(this))),
+      proxy_resolver_(proxy_resolver_factory.Run(&host_resolver_)),
+      binding_(&proxy_resolver_, request.Pass()) {
+  binding_.set_error_handler(this);
+}
+
+void MojoProxyResolverHolder::OnConnectionError() {
+  delete this;
+}
+
+}  // namespace
+
+MojoProxyResolverFactoryImpl::MojoProxyResolverFactoryImpl(
+    const MojoProxyResolverFactoryImpl::Factory& proxy_resolver_factory,
+    mojo::InterfaceRequest<interfaces::ProxyResolverFactory> request)
+    : proxy_resolver_impl_factory_(proxy_resolver_factory),
+      binding_(this, request.Pass()) {
+}
+
+MojoProxyResolverFactoryImpl::MojoProxyResolverFactoryImpl(
+    mojo::InterfaceRequest<interfaces::ProxyResolverFactory> request)
+    : MojoProxyResolverFactoryImpl(base::Bind(&CreateDefaultProxyResolver),
+                                   request.Pass()) {
+}
+
+MojoProxyResolverFactoryImpl::~MojoProxyResolverFactoryImpl() = default;
+
+void MojoProxyResolverFactoryImpl::CreateResolver(
+    mojo::InterfaceRequest<interfaces::ProxyResolver> request,
+    interfaces::HostResolverPtr host_resolver) {
+  // The MojoProxyResolverHolder will delete itself when either |request| or
+  // |host_resolver| encounters a connection error, that is, when either the
+  // ProxyResolver client or the HostResolver implementation is deleted.
+  new MojoProxyResolverHolder(proxy_resolver_impl_factory_, request.Pass(),
+                              host_resolver.Pass());
+}
+
+}  // namespace net