Use a utility process for the Mojo v8 proxy resolver.

chrome/utility/chrome_content_utility_client.cc

Index: chrome/utility/chrome_content_utility_client.cc
diff --git a/chrome/utility/chrome_content_utility_client.cc b/chrome/utility/chrome_content_utility_client.cc
index 843b1f37ea88030b14df9df1bb7689375d07486c..cfe35d0010390dd12e3476509830b39c0bc7abc8 100644
--- a/chrome/utility/chrome_content_utility_client.cc
+++ b/chrome/utility/chrome_content_utility_client.cc
@@ -15,6 +15,7 @@
 #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"
@@ -27,6 +28,7 @@
 
 #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)
@@ -160,6 +162,29 @@ bool ChromeContentUtilityClient::OnMessageReceived(
   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)