Add icu.isolate

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': [
+    ['icu_use_data_file_flag==1 and OS!="ios"', {

[jungshik at Google, 2014/01/06 23:57:22]

The above line is not liked by convert_old_to_new_format() in isolate.py. That's
for the backward compatibility and has a comment saying that it should be gone
when no old isolate format file is left. 

With a call to convert_old_to_new_format() commented out, I still have an
assertion failure ('len(condition)==2' in verify_condition in isolate.py). 

It looks like I'm not supposed to use if-then-else. Instead, a series of
if-then's have to be used. 

I wonder whether a nested conditions are allowed. 

+      'variables': {
+        'isolate_dependency_tracked': [
+          '<(PRODUCT_DIR)/icudtl.dat',
+        ],
+      },
+    }, {
+      'conditions': [
+        ['OS=="win"', {
+          'variables': {
+            'isolate_dependency_tracked': [
+              '<(PRODUCT_DIR)/icudt.dll',
+            ],
+          },
+        }],
+      ],
+    }],
+  ],
+}