Build the Editor from GYP/build.py.

dart/dart.gyp

Index: dart/dart.gyp
diff --git a/dart/dart.gyp b/dart/dart.gyp
index d206fccbe4e269668a628029d0d2accdb1ef6959..9778fc3720ea67689587e96b5d0a8a575db6c4c1 100644
--- a/dart/dart.gyp
+++ b/dart/dart.gyp
@@ -114,6 +114,44 @@
       ],
     },
     {
+      'target_name': 'editor',
+      'type': 'none',
+      'dependencies': [
+        'editor/build/generated/editor_deps.gyp:editor_deps',
+
+        # This dependency on create_sdk does not mean that the Editor
+        # is rebuilt if the SDK is. It only means that when you build
+        # the Editor, you should also build the SDK. If we wanted to
+        # make sure that the editor is rebuilt when the SDK is, we
+        # should list a *file* in PRODUCT_DIR which the action below
+        # uses as input.
+        # This is the desired behavior as we would otherwise have to
+        # rebuild the editor each time the VM, dart2js, or library
+        # code changes.
+        'create_sdk',
+      ],
+      'actions': [
+        {
+          'action_name': 'create_editor_py',
+          'inputs': [
+            'tools/create_editor.py',
+            '<(SHARED_INTERMEDIATE_DIR)/editor_deps/editor.stamp',
+            '<!@(["python", "tools/list_files.py", "", "editor/tools/features/com.google.dart.tools.deploy.feature_releng"])',
+          ],
+          'outputs': [
+            '<(PRODUCT_DIR)/editor/VERSION',
+          ],
+          'action': [
+            'python',
+            'tools/create_editor.py',
+            '--out', '<(PRODUCT_DIR)/editor',
+            '--build', '<(INTERMEDIATE_DIR)',
+          ],
+          'message': 'Creating editor.',
+        },
+      ],
+    },
+    {
       'target_name': 'samples',
       'type': 'none',
       'dependencies': [