Componentize renderer side of DNS prefetching.

components/dns_prefetch.gypi

+# Copyright 2014 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.
+
+{
+  'targets': [
+    {
+      # GN version: //components/dns_prefetch/common
+      'target_name': 'dns_prefetch_common',
+      'type': 'static_library',
+      'include_dirs': [
+        '..',
+      ],
+      'dependencies': [
+        '../base/base.gyp:base',
+      ],
+      'sources': [
+        'dns_prefetch/common/prefetch_common.cc',
+        'dns_prefetch/common/prefetch_common.h',
+        'dns_prefetch/common/prefetch_message_generator.cc',
+        'dns_prefetch/common/prefetch_message_generator.h',
+        'dns_prefetch/common/prefetch_messages.cc',
+        'dns_prefetch/common/prefetch_messages.h',
+      ],
+    },
+  ],
+  'conditions': [
+    ['OS!="ios"', {
+      'targets': [
+        {
+          # GN version: //components/dns_prefetch/renderer
+          'target_name': 'dns_prefetch_renderer',
+          'type': 'static_library',
+          'include_dirs': [
+            '..',
+          ],
+          'dependencies': [
+            'dns_prefetch_common',
+            '../content/content.gyp:content_renderer',
+          ],
+          'sources': [
+            'dns_prefetch/renderer/predictor_queue.cc',
+            'dns_prefetch/renderer/predictor_queue.h',
+            'dns_prefetch/renderer/renderer_net_predictor.cc',
+            'dns_prefetch/renderer/renderer_net_predictor.h',
+          ],
+        },
+      ],
+    }],
+  ],
+}