Revert of Revert of Add Mojo interfaces for out-of-process proxy resolver. (patchset #1 id:1 of https://codereview.chromium.org/892373006/)

Reason for revert:
The code in this change is not linked into any binary.

Test is flaky:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=device_unittests&tests=SerialConnectionTest.Cancel

The likely cause of the test failure is bc78a2320b. The author has been informed and the test will be fixed soon.

Original issue's description:
> Revert of Add Mojo interfaces for out-of-process proxy resolver. (patchset #4 id:60001 of https://codereview.chromium.org/900433003/)
>
> Reason for revert:
> http://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29%281%29/builds/38575
> Broke device_unittests device_unittests SerialConnectionTest.Cancel it seems.
>
> Original issue's description:
> > Add Mojo interfaces for out-of-process proxy resolver.
> >
> > See:
> > https://docs.google.com/a/chromium.org/document/d/1n5hr4KJhZl2A4MicTfmyiHPdiKp7kmUoWXnRBN8SrZE/edit#
> >
> > BUG=11746
> >
> > Committed: https://crrev.com/073e42bb7587b90594e5799fb6a4afe08a1e1561
> > Cr-Commit-Position: refs/heads/master@{#314509}
>
> TBR=rdsmith@chromium.org,eroman@chromium.org,sammc@chromium.org,amistry@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=11746
>
> Committed: https://crrev.com/7d4ec1aa24e79406d29e0cafbb531a3fabfe815f
> Cr-Commit-Position: refs/heads/master@{#314519}

TBR=rdsmith@chromium.org,eroman@chromium.org,sammc@chromium.org,noel@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=11746

Review URL: https://codereview.chromium.org/882173005

Cr-Commit-Position: refs/heads/master@{#314527}

net/interfaces/BUILD.gn

@@ -0,0 +1,12 @@
+# 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.
+
+import("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
+
+mojom("interfaces") {
+  sources = [
+    "host_resolver_service.mojom",
+    "proxy_resolver_service.mojom",
+  ]
+}

net/interfaces/host_resolver_service.mojom

@@ -0,0 +1,55 @@
+// 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.
+
+// WARNING! Do NOT use this mojom. It is intended as a temporary interface to
+// implement out-of-process proxy resolution. If you wish to use a Mojo DNS
+// service, contact amistry@/sammc@ and net-dev to discuss a permanent Mojo DNS
+// interface.
+
+// Put Mojo definitions into their own namespace to avoid collisions with C++
+// definitions.
+// TODO(amistry): Resolve the conflict between these two sets of definitions.
+module net.interfaces;
+
+// Mirror of net::AddressFamily.
+enum AddressFamily {
+  UNSPECIFIED,
+  IPV4,
+  IPV6,
+};
+
+// Mirror of net::HostResolver::RequestInfo.
+struct HostResolverRequestInfo {
+  string host;
+  uint16 port;
+  AddressFamily address_family;
+  bool is_my_ip_address;
+};
+
+// Mirror of net::IPEndPoint.
+struct IPEndPoint {
+  // IP address as a numeric value from most to least significant byte.
+  // Will be of length 4 for IPv4 addresses and 16 for IPv6.
+  array<uint8> address;
+  uint16 port;
+};
+
+// Mirror of net::AddressList.
+struct AddressList {
+  array<IPEndPoint> addresses;
+};
+
+interface HostResolverService {
+  // Use a HostResolverRequestClient instead of returning a result so we can
+  // cancel in-flight requests by destroying the client.  IPC requests in Mojo
+  // cannot be cancelled directly.
+  // TODO(amistry): Add BoundNetLog.
+  Resolve(HostResolverRequestInfo request_info,
+          HostResolverRequestClient client);
+};
+
+interface HostResolverRequestClient {
+  // |error| is a value in net::Error.
+  ReportResult(int32 error, AddressList? result);
+};

net/interfaces/proxy_resolver_service.mojom

@@ -0,0 +1,48 @@
+// 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.
+
+// Put Mojo definitions into their own namespace to avoid collisions with C++
+// definitions.
+// TODO(amistry): Resolve the conflict between these two sets of definitions.
+module net.interfaces;
+
+import "host_resolver_service.mojom";
+
+// Mirror of net::ProxyServer::Scheme.
+enum ProxyScheme {
+  INVALID,
+  DIRECT,
+  HTTP,
+  SOCKS4,
+  SOCKS5,
+  HTTPS,
+  QUIC,
+};
+
+// Mirror of net::ProxyServer.
+struct ProxyServer {
+  ProxyScheme scheme;
+  string host;
+  uint16 port;
+};
+
+interface ProxyResolverService {
+  SetPacScript(string data) => (int32 result);
+
+  // Use a ProxyResolverRequestClient instead of returning a result so we can
+  // receive load state updates and cancel in-flight requests by destroying the
+  // client.
+  // TODO(amistry): Add BoundNetLog.
+  GetProxyForUrl(string url, ProxyResolverRequestClient client);
+};
+
+interface ProxyResolverRequestClient {
+  ReportResult(int32 error, array<ProxyServer>? proxy_servers);
+};
+
+interface ProxyResolverFactory {
+  // TODO(amistry): Add NetLog and ProxyResolverErrorObserver.
+  CreateResolver(ProxyResolverService& resolver,
+                 HostResolverService host_resolver);
+};

net/net.gyp

@@ -1203,6 +1203,22 @@
         },
       ],
     }],
+    ['use_v8_in_net == 1 and OS != "android"', {
+      'targets': [
+        {
+          # GN version: //net/interfaces
+          'target_name': 'net_interfaces',
+          'type': 'static_library',
+          'sources': [
+            'interfaces/host_resolver_service.mojom',
+            'interfaces/proxy_resolver_service.mojom',
+          ],
+          'includes': [
+            '../third_party/mojo/mojom_bindings_generator.gypi',
+          ],
+        },
+      ],
+    }],
     ['OS != "ios" and OS != "android"', {
       'targets': [
         # iOS doesn't have the concept of simple executables, these targets