Plugin Power Saver: Overhaul plugin-power-saver flags. Show in UI.

components/plugins.gypi

 # Copyright 2013 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/plugins/common
+      'target_name': 'plugins_common',
+      'type': 'static_library',
+      'sources': [
+        'plugins/common/plugins_switches.cc',
+        'plugins/common/plugins_switches.h',
+        'plugins/common/plugins_field_trial.cc',
+        'plugins/common/plugins_field_trial.h',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'dependencies': [
+        '../base/base.gyp:base',
+      ],
+    },
+    {
       # GN version: //components/plugins/renderer
       'target_name': 'plugins_renderer',
       'type': 'static_library',
       'dependencies': [
         '../gin/gin.gyp:gin',
         '../skia/skia.gyp:skia',
         '../third_party/WebKit/public/blink.gyp:blink',
         '../third_party/re2/re2.gyp:re2',
         '../v8/tools/gyp/v8.gyp:v8',
       ],
@@ skipping 14 matching lines @@
           'sources': [
             # Note: sources list duplicated in GN build.
             'plugins/renderer/mobile_youtube_plugin.cc',
             'plugins/renderer/mobile_youtube_plugin.h',
           ]
         }],
       ],
     },
   ]
 }