Componentize sad_tab

components/sad_tab.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/sad_tab
+      'target_name': 'sad_tab',
+      'type': 'static_library',
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../content/content.gyp:content',
+        '../ui/base/ui_base.gyp:ui_base',
+        '../url/url.gyp:url_lib',
+        'components_strings.gyp:components_strings',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        # Note: sources list duplicated in GN build.
+        'sad_tab/sad_tab.cc',
+        'sad_tab/sad_tab.h',
+        'sad_tab/sad_tab_client.h',
+        'sad_tab/sad_tab_helper.cc',
+        'sad_tab/sad_tab_helper.h',
+        'sad_tab/sad_tab_types.h',
+        'sad_tab/url_constants.cc',
+        'sad_tab/url_constants.h',
+      ],
+      'conditions': [
+        ['toolkit_views==1', {
+          'dependencies': [
+            '../ui/views/views.gyp:views',
+          ],
+          'sources': [
+            'sad_tab/views/sad_tab_view.cc',
+            'sad_tab/views/sad_tab_view.h',
+          ],
+        }],
+      ],
+    },
+  ],
+}