Move grit from DEPS into src.

tools/grit/grit/node/empty.py

Index: tools/grit/grit/node/empty.py
diff --git a/tools/grit/grit/node/empty.py b/tools/grit/grit/node/empty.py
new file mode 100755
index 0000000000000000000000000000000000000000..b3759a27cebcbfd7e7fa6829f2838aba264b0261
--- /dev/null
+++ b/tools/grit/grit/node/empty.py
@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+# Copyright (c) 2012 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.
+
+'''Container nodes that don't have any logic.
+'''
+
+
+from grit.node import base
+from grit.node import include
+from grit.node import structure
+from grit.node import message
+from grit.node import io
+from grit.node import misc
+
+
+class GroupingNode(base.Node):
+  '''Base class for all the grouping elements (<structures>, <includes>,
+  <messages> and <identifiers>).'''
+  def DefaultAttributes(self):
+    return {
+      'first_id' : '',
+      'comment' : '',
+      'fallback_to_english' : 'false',
+      'fallback_to_low_resolution' : 'false',
+    }
+
+
+class IncludesNode(GroupingNode):
+  '''The <includes> element.'''
+  def _IsValidChild(self, child):
+    return isinstance(child, (include.IncludeNode, misc.IfNode, misc.PartNode))
+
+
+class MessagesNode(GroupingNode):
+  '''The <messages> element.'''
+  def _IsValidChild(self, child):
+    return isinstance(child, (message.MessageNode, misc.IfNode, misc.PartNode))
+
+
+class StructuresNode(GroupingNode):
+  '''The <structures> element.'''
+  def _IsValidChild(self, child):
+    return isinstance(child, (structure.StructureNode,
+                              misc.IfNode, misc.PartNode))
+
+
+class TranslationsNode(base.Node):
+  '''The <translations> element.'''
+  def _IsValidChild(self, child):
+    return isinstance(child, (io.FileNode, misc.IfNode, misc.PartNode))
+
+
+class OutputsNode(base.Node):
+  '''The <outputs> element.'''
+  def _IsValidChild(self, child):
+    return isinstance(child, (io.OutputNode, misc.IfNode, misc.PartNode))
+
+
+class IdentifiersNode(GroupingNode):
+  '''The <identifiers> element.'''
+  def _IsValidChild(self, child):
+    return isinstance(child, misc.IdentifierNode)