Add chrome_html gatherer, which inlines html and automatically generates image set…

grit/format/data_pack.py

Index: grit/format/data_pack.py
diff --git a/grit/format/data_pack.py b/grit/format/data_pack.py
index e3234e87d2e1480b052b68aef843799307cfa978..8a4ef1eb6eaffe4245d026a91994d1d7a9c439b6 100755
--- a/grit/format/data_pack.py
+++ b/grit/format/data_pack.py
@@ -16,6 +16,7 @@ sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..'))
 from grit.format import interface
 from grit.node import include
 from grit.node import message
+from grit.node import structure
 from grit.node import misc
 
 
@@ -51,7 +52,8 @@ class DataPack(interface.ItemFormatter):
     if (isinstance(item, misc.IfNode) and not item.IsConditionSatisfied()):
       return nodes
     if (isinstance(item, include.IncludeNode) or
-        isinstance(item, message.MessageNode)):
+        isinstance(item, message.MessageNode) or
+        isinstance(item, structure.StructureNode)):
       # Include this node if it wasn't marked as skipped by a whitelist.
       if not item.WhitelistMarkedAsSkip():
         return [item]