Add support for building the Dart VM for Android OS.

dart.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.
 
 {
   'targets': [
     {
       'target_name': 'compiler',
       'type': 'none',
       'dependencies': [
         'compiler/dart-compiler.gyp:dart_analyzer',
       ],
       'actions': []
     },
     {
       'target_name': 'runtime',
       'type': 'none',
       'dependencies': [
         'runtime/dart-runtime.gyp:dart',
         'runtime/dart-runtime.gyp:run_vm_tests',
         'runtime/dart-runtime.gyp:process_test',
         'runtime/dart-runtime.gyp:test_extension',
       ],
+      'conditions': [
+        ['dart_want_separate_host_toolset==1', {
+          'toolsets': ['host'],
+        }, {
+          'toolsets': ['target'],
+        }],
+      ]
     },
     {
       # Build the SDK. This target is separate from upload_sdk as the
       # editor needs to build the SDK without uploading it.
       'target_name': 'create_sdk',
       'type': 'none',
       'dependencies': [
         'runtime/dart-runtime.gyp:dart',
         'dart2js',
       ],
@@ skipping 25 matching lines @@
             }],
           ],
         },
       ],
       'conditions' : [
         ['(OS=="linux" or OS=="mac") ', {
           'dependencies': [
             'compiler',
           ],
         }],
+        ['dart_want_separate_host_toolset==1', {
+            'toolsets': ['host'],
+          }, {
+            'toolsets': ['target'],
+          }],
       ],
     },
     {
       # Upload the SDK. This target is separate from create_sdk as the
       # editor needs to build the SDK without uploading it.
       'target_name': 'upload_sdk',
       'type': 'none',
       'dependencies': [
         'create_sdk',
       ],
       'actions': [
         {
           'action_name': 'upload_sdk_py',
           'inputs': [
             '<(PRODUCT_DIR)/dart-sdk/create.stamp',
             'tools/upload_sdk.py',
           ],
           'outputs': [
             '<(PRODUCT_DIR)/dart-sdk/upload.stamp',
           ],
           'action': [
             'python',
             'tools/upload_sdk.py',
             '<(PRODUCT_DIR)/dart-sdk'
           ],
         },
       ],
+      'conditions': [
+          ['dart_want_separate_host_toolset==1', {
+            'toolsets': ['host'],
+          }, {
+            'toolsets': ['target'],
+          }],
+      ],
     },
     {
       'target_name': 'dart2js',
       'type': 'none',
       'dependencies': [
         'utils/compiler/compiler.gyp:dart2js',
       ],
+      'conditions': [
+          ['dart_want_separate_host_toolset==1', {
+            'toolsets': ['host'],
+          }, {
+            'toolsets': ['target'],
+          }],
+      ],
     },
     {
       'target_name': 'api_docs',
       'type': 'none',
       'dependencies': [
         'utils/apidoc/apidoc.gyp:api_docs',
       ],
+      'conditions': [
+          ['dart_want_separate_host_toolset==1', {
+            'toolsets': ['host'],
+          }, {
+            'toolsets': ['target'],
+          }]
+    ],
     }
   ],
 }