Add support for building the Dart VM for Android OS.

utils/compiler/compiler.gyp

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables': {
     'dart_dir': '../..',
   },
   'targets': [
     {
       'target_name': 'dart2js',
       'type': 'none',
       'dependencies': [
         '../../runtime/dart-runtime.gyp:dart',
-        '../../third_party/v8/src/d8.gyp:d8',
       ],
+      'conditions': [
+        ['dart_want_separate_host_toolset!=1', {
+          'dependencies': [
+            '../../third_party/v8/src/d8.gyp:d8',
+            ]
+          }
+        ]
+      ],
+
       'actions': [
         {
           'action_name': 'build_dart2js',
           'inputs': [
             '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
             'build_helper.dart',
           ],
           'outputs': [
             '<(PRODUCT_DIR)/dart2js',
             '<(PRODUCT_DIR)/dart2js.bat',
@@ skipping 12 matching lines @@
             # GYP so it doesn't work.
             '<(PRODUCT_DIR)',
             '<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
             'dart2js',
             'dart2js_developer',
             'dartdoc',
             '<(dart_dir)',
           ],
         },
       ],
+      'conditions': [
+          ['dart_want_separate_host_toolset==1', {
+            'toolsets': ['host'],
+          }, {
+            'toolsets': ['target'],
+          }]
+      ],
     },
   ],
 }