Add support for component=shared_library for base_unittests.

icu.isolate

 # Copyright 2014 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.
 {
   'conditions': [
     # iOS always has the icu data in the bundle and we don't have to
     # specify the dependency for iOS here.
     ['icu_use_data_file_flag==1 and (OS=="linux" or OS=="win" or OS=="mac" or OS=="android")', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/icudtl.dat',
         ],
       },
     }],
     # When icu data is not used, other platforms link it statically.
     ['icu_use_data_file_flag==0 and OS=="win"', {
       'variables': {
           'isolate_dependency_tracked': [
             '<(PRODUCT_DIR)/icudt.dll',
         ],
       },
     }],
+    ['OS=="linux" and component=="shared_library"', {
+      'variables': {
+        'isolate_dependency_tracked': [
+          '<(PRODUCT_DIR)/lib/libicui18n.so',
+          '<(PRODUCT_DIR)/lib/libicuuc.so',
+        ],
+      },
+    }],
+    ['OS=="mac" and component=="shared_library"', {
+      'variables': {
+        'isolate_dependency_tracked': [
+          '<(PRODUCT_DIR)/libicui18n.dylib',
+          '<(PRODUCT_DIR)/libicuuc.dylib',
+        ],
+      },
+    }],
+    ['OS=="win" and component=="shared_library"', {
+      'variables': {
+        'isolate_dependency_tracked': [
+          '<(PRODUCT_DIR)/icui18n.dll',
+          '<(PRODUCT_DIR)/icuuc.dll',
+        ],
+      },
+    }],
   ],
 }