Add documentation for platform/bindings

third_party/WebKit/Source/platform/bindings/DOMDataStore.h

Index: third_party/WebKit/Source/platform/bindings/DOMDataStore.h
diff --git a/third_party/WebKit/Source/platform/bindings/DOMDataStore.h b/third_party/WebKit/Source/platform/bindings/DOMDataStore.h
index 4db267a44e0ba6581be42dc9cfe8ab32cc20ef69..793dc5fcd60a0f7158b1fb4fcda4898718d9e6d3 100644
--- a/third_party/WebKit/Source/platform/bindings/DOMDataStore.h
+++ b/third_party/WebKit/Source/platform/bindings/DOMDataStore.h
@@ -46,6 +46,10 @@
 
 namespace blink {
 
+// Holds a DOMWrapperMap specialized to map between ScriptWrappable objects and
+// their wrappers and provides an API to perform common operations with this map
+// and manage wrappers in a single world. Each world (DOMWrapperWorld) holds a
+// single DOMWrapperMap instance to hold wrappers only for that world.
 class DOMDataStore {
   WTF_MAKE_NONCOPYABLE(DOMDataStore);
   USING_FAST_MALLOC(DOMDataStore);