Implement use_system_icu for Android.

icu.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': {
     'use_system_icu%': 0,
     'icu_use_data_file_flag%': 0,
   },
   'target_defaults': {
@@ skipping 553 matching lines @@
     }, { # use_system_icu != 0
       'targets': [
         {
           'target_name': 'system_icu',
           'type': 'none',
           'direct_dependent_settings': {
             'defines': [
               'USE_SYSTEM_ICU',
             ],
           },
-          'link_settings': {
-            'ldflags': [
-              '<!@(icu-config --ldflags)',
-            ],
-            'libraries': [
-              '<!@(icu-config --ldflags-libsonly)',
-            ],
-          },
+          'conditions': [
+            ['OS=="android"', {
+              'direct_dependent_settings': {
+                'include_dirs': [
+                  '<(android_src)/external/icu4c/common',
+                  '<(android_src)/external/icu4c/i18n',
+                ],
+              },
+              'link_settings': {
+                'libraries': [
+                  '-licui18n',
+                  '-licuuc',
+                ],
+              },
+            },{ # OS!="android"
+              'link_settings': {
+                'ldflags': [
+                  '<!@(icu-config --ldflags)',
+                ],
+                'libraries': [
+                  '<!@(icu-config --ldflags-libsonly)',
+                ],
+              },
+            }],
+          ],
         },
         {
           'target_name': 'icudata',
           'type': 'none',
           'dependencies': ['system_icu'],
           'export_dependent_settings': ['system_icu'],
         },
         {
           'target_name': 'icui18n',
           'type': 'none',
           'dependencies': ['system_icu'],
           'export_dependent_settings': ['system_icu'],
         },
         {
           'target_name': 'icuuc',
           'type': 'none',
           'dependencies': ['system_icu'],
           'export_dependent_settings': ['system_icu'],
         },
       ],
     }],
   ],
 }