Use a utility process for the Mojo v8 proxy resolver.

chrome/utility/chrome_content_utility_client.cc

 // Copyright (c) 2012 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 "chrome/utility/chrome_content_utility_client.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/json/json_reader.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "chrome/common/chrome_utility_messages.h"
 #include "chrome/common/safe_browsing/zip_analyzer.h"
 #include "chrome/utility/chrome_content_utility_ipc_whitelist.h"
 #include "chrome/utility/utility_message_handler.h"
 #include "content/public/child/image_decoder_utils.h"
 #include "content/public/common/content_switches.h"
+#include "content/public/common/service_registry.h"
 #include "content/public/utility/utility_thread.h"
 #include "courgette/courgette.h"
 #include "courgette/third_party/bsdiff.h"
 #include "ipc/ipc_channel.h"
 #include "skia/ext/image_operations.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/zlib/google/zip.h"
 #include "ui/gfx/codec/jpeg_codec.h"
 #include "ui/gfx/geometry/size.h"
 
 #if !defined(OS_ANDROID)
 #include "chrome/utility/profile_import_handler.h"
+#include "net/proxy/mojo_proxy_resolver_factory_impl.h"
 #endif
 
 #if defined(OS_WIN)
 #include "chrome/utility/font_cache_handler_win.h"
 #include "chrome/utility/shell_handler_win.h"
 #endif
 
 #if defined(ENABLE_EXTENSIONS)
 #include "chrome/common/extensions/chrome_utility_extensions_messages.h"
 #include "chrome/utility/extensions/extensions_handler.h"
@@ skipping 113 matching lines @@
   IPC_END_MESSAGE_MAP()
 
   for (Handlers::iterator it = handlers_.begin();
        !handled && it != handlers_.end(); ++it) {
     handled = (*it)->OnMessageReceived(message);
   }
 
   return handled;
 }
 
+#if !defined(OS_ANDROID)
+namespace {

[Lei Zhang, 2015/03/05 23:42:49]

There's already an anonymous namespace at line 55. Combine?

[Anand Mistry (off Chromium), 2015/03/10 07:24:23]

Done.

+
+void CreateProxyResolverFactory(
+    mojo::InterfaceRequest<net::interfaces::ProxyResolverFactory> request) {
+  // MojoProxyResolverFactoryImpl is strongly bound to the Mojo message pipe it
+  // is connected to. When that message pipe is closed, either explicitly on the
+  // other end (in the browser process), or by a connection error, this object
+  // will be destroyed.
+  new net::MojoProxyResolverFactoryImpl(request.Pass());

[eroman, 2015/03/06 05:48:21]

perhaps I am dense but I find this pattern confusing each and every time I see
it....

[Anand Mistry (off Chromium), 2015/03/10 07:24:23]

I agree, but it's what we want. We want the object lifetime to be connected to
the life of the connection, which is what the StrongBinding<> in the
implementation does.

+}
+
+}  // namespace
+#endif  // OS_ANDROID
+
+void ChromeContentUtilityClient::RegisterMojoServices(
+    content::ServiceRegistry* registry) {
+#if !defined(OS_ANDROID)
+  registry->AddService<net::interfaces::ProxyResolverFactory>(
+      base::Bind(CreateProxyResolverFactory));
+#endif
+}
+
 // static
 void ChromeContentUtilityClient::PreSandboxStartup() {
 #if defined(ENABLE_EXTENSIONS)
   extensions::ExtensionsHandler::PreSandboxStartup();
 #endif
 
 #if defined(ENABLE_MDNS)
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kUtilityProcessEnableMDns)) {
     local_discovery::ServiceDiscoveryMessageHandler::PreSandboxStartup();
@@ skipping 171 matching lines @@
     const std::string& mime_type, int64 total_size, bool get_attached_images) {
   // Only one IPCDataSource may be created and added to the list of handlers.
   metadata::IPCDataSource* source = new metadata::IPCDataSource(total_size);
   handlers_.push_back(source);
 
   metadata::MediaMetadataParser* parser = new metadata::MediaMetadataParser(
       source, mime_type, get_attached_images);
   parser->Start(base::Bind(&FinishParseMediaMetadata, base::Owned(parser)));
 }
 #endif