Refactor ChooserBubbleUiViewDelegate

components/chooser_controller.gypi

Index: components/chooser_controller.gypi
diff --git a/components/chooser_controller.gypi b/components/chooser_controller.gypi
index dd94dae33ba0c017fd93ca5020dcb335402b06f8..4c3cb692eea5f9dc89841c57292f815dc0abcbf3 100644
--- a/components/chooser_controller.gypi
+++ b/components/chooser_controller.gypi
@@ -21,5 +21,22 @@
         'chooser_controller/chooser_controller.h',
       ],
     },
+    {
+      'target_name': 'chooser_controller_test_support',
+      'type': 'static_library',
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../testing/gmock.gyp:gmock',
+        'chooser_controller',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        # Note: sources list duplicated in GN build.
+        'chooser_controller/mock_chooser_controller.cc',
+        'chooser_controller/mock_chooser_controller.h',
+      ],
+    },
   ],
 }