Re-implement the screensaver to use WebView instead of ExtensionDialogHost.

ui/views/views.gyp

Index: ui/views/views.gyp
diff --git a/ui/views/views.gyp b/ui/views/views.gyp
index 7919b8e36256748cbe6a5cdae404e97d365d04d2..e83e467bae8d0acc986c90d2ce81b47ef9168bdc 100644
--- a/ui/views/views.gyp
+++ b/ui/views/views.gyp
@@ -451,6 +451,32 @@
       ],
     }, # target_name: views
     {
+      'target_name': 'test_support_views',
+      'type': 'static_library',
+      'dependencies': [
+        '../../base/base.gyp:base',
+        '../../content/content.gyp:test_support_content',
+        '../../ipc/ipc.gyp:test_support_ipc',
+        '../../net/net.gyp:net_test_support',
+        '../../skia/skia.gyp:skia',
+        '../../testing/gtest.gyp:gtest',
+        '../ui.gyp:ui',
+        'views',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'test/test_tooltip_client.h',
+        'test/test_views_delegate.cc',
+        'test/test_views_delegate.h',
+        'test/views_test_base.cc',
+        'test/views_test_base.h',
+        'test/webview_test_helper.cc',
+        'test/webview_test_helper.h',
+      ],
+    },  # target_name: test_support_views
+    {
       'target_name': 'views_unittests',
       'type': 'executable',
       'dependencies': [
@@ -473,6 +499,7 @@
         '../ui.gyp:ui',
         '../ui.gyp:ui_resources',
         '../ui.gyp:ui_resources_standard',
+        'test_support_views',
         'views',
       ],
       'include_dirs': [
@@ -504,11 +531,6 @@
         'focus/focus_traversal_unittest.cc',
         'layout/box_layout_unittest.cc',
         'layout/grid_layout_unittest.cc',
-        'test/test_tooltip_client.h',
-        'test/test_views_delegate.cc',
-        'test/test_views_delegate.h',
-        'test/views_test_base.cc',
-        'test/views_test_base.h',
         'view_model_unittest.cc',
         'view_model_utils_unittest.cc',
         'view_unittest.cc',
@@ -655,6 +677,7 @@
         '../../chrome/chrome_resources.gyp:packed_resources',
         '../../content/content.gyp:content_shell_lib',
         '../../content/content.gyp:content',
+        '../../content/content.gyp:test_support_content',
         '../../skia/skia.gyp:skia',
         '../../third_party/icu/icu.gyp:icui18n',
         '../../third_party/icu/icu.gyp:icuuc',