[Android] Add a java.lang.System wrapper.

base/base.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 1363 matching lines @@
             'android/java/src/org/chromium/base/TraceEvent.java',
             'android/java/src/org/chromium/base/library_loader/LibraryLoader.java',
             'android/java/src/org/chromium/base/metrics/RecordHistogram.java',
             'android/java/src/org/chromium/base/metrics/RecordUserAction.java',
           ],
           'variables': {
             'jni_gen_package': 'base',
           },
           'dependencies': [
             'android_runtime_jni_headers',
+            'android_system_jni_headers',
           ],
           'includes': [ '../build/jni_generator.gypi' ],
         },
         {
           # GN: //base:android_runtime_jni_headers
           'target_name': 'android_runtime_jni_headers',
           'type': 'none',
           'variables': {
             'jni_gen_package': 'base',
             'input_java_class': 'java/lang/Runtime.class',
           },
           'includes': [ '../build/jar_file_jni_generator.gypi' ],
         },
         {
+          # GN: //base:android_system_jni_headers
+          'target_name': 'android_system_jni_headers',
+          'type': 'none',
+          'variables': {
+             'jni_gen_package': 'base',
+             'input_java_class': 'java/lang/System.class',
+           },
+          'includes': [ '../build/jar_file_jni_generator.gypi' ],
+        },
+        {
           # TODO(GN)
           'target_name': 'base_unittests_jni_headers',
           'type': 'none',
           'sources': [
             'test/android/java/src/org/chromium/base/ContentUriTestUtils.java',
             'test/android/java/src/org/chromium/base/TestUiThread.java',
           ],
           'variables': {
             'jni_gen_package': 'base',
           },
@@ skipping 217 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }