Modify blink type map to finalize lazily

sdk/lib/_blink/dartium/_blink_dartium.dart

 /**
  * This library provides entry points to the native Blink code which backs
  * up the dart:html library.
  */
 library dart.dom._blink;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html';
 import 'dart:_internal' hide Symbol, deprecated;
@@ skipping 7168 matching lines @@
 
 Native_TreeWalker_previousNode_Callback(mthis) native "TreeWalker_previousNode_Callback_RESOLVER_STRING_0_";
 
 Native_TreeWalker_previousSibling_Callback(mthis) native "TreeWalker_previousSibling_Callback_RESOLVER_STRING_0_";
 
   // Generated overload resolver
 Native_URL_createObjectUrl(blob_OR_source_OR_stream) {
     if ((blob_OR_source_OR_stream is Blob || blob_OR_source_OR_stream == null)) {
       return Native_URL__createObjectURL_1_Callback(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaStream || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is MediaSource || blob_OR_source_OR_stream == null)) {
       return Native_URL__createObjectURL_2_Callback(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaSource || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is MediaStream || blob_OR_source_OR_stream == null)) {
       return Native_URL__createObjectURL_3_Callback(blob_OR_source_OR_stream);
     }
     throw new ArgumentError("Incorrect number or type of arguments");
   }
 
 Native_URL__createObjectURL_1_Callback(blob_OR_source_OR_stream) native "URL_createObjectURL_Callback_RESOLVER_STRING_1_Blob";
 
-Native_URL__createObjectURL_2_Callback(blob_OR_source_OR_stream) native "URL_createObjectURL_Callback_RESOLVER_STRING_1_MediaStream";
+Native_URL__createObjectURL_2_Callback(blob_OR_source_OR_stream) native "URL_createObjectURL_Callback_RESOLVER_STRING_1_MediaSource";
 
-Native_URL__createObjectURL_3_Callback(blob_OR_source_OR_stream) native "URL_createObjectURL_Callback_RESOLVER_STRING_1_MediaSource";
+Native_URL__createObjectURL_3_Callback(blob_OR_source_OR_stream) native "URL_createObjectURL_Callback_RESOLVER_STRING_1_MediaStream";
 
 Native_URL_createObjectUrlFromBlob_Callback(blob) native "URL_createObjectURL_Callback_RESOLVER_STRING_1_Blob";
 
 Native_URL_createObjectUrlFromSource_Callback(source) native "URL_createObjectURL_Callback_RESOLVER_STRING_1_MediaSource";
 
 Native_URL_createObjectUrlFromStream_Callback(stream) native "URL_createObjectURL_Callback_RESOLVER_STRING_1_MediaStream";
 
 Native_URL_revokeObjectURL_Callback(url) native "URL_revokeObjectURL_Callback_RESOLVER_STRING_1_DOMString";
 
 Native_URL_hash_Getter(mthis) native "URL_hash_Getter";
@@ skipping 1077 matching lines @@
 Native_XSLTProcessor_setParameter_Callback(mthis, namespaceURI, localName, value) native "XSLTProcessor_setParameter_Callback";
 
 Native_XSLTProcessor_transformToDocument_Callback(mthis, source) native "XSLTProcessor_transformToDocument_Callback_RESOLVER_STRING_1_Node";
 
 Native_XSLTProcessor_transformToFragment_Callback(mthis, source, docVal) native "XSLTProcessor_transformToFragment_Callback_RESOLVER_STRING_2_Node_Document";
 
 
 // TODO(vsm): This should be moved out of this library.  Into dart:html?
 Type _getType(String key) {
   // TODO(vsm): Add Cross Frame and JS types here as well.
   if (htmlBlinkMap.containsKey(key))

[vsm, 2014/05/28 15:07:45]

If initializing htmlBlinkMap is too expensive, we could add a shortcut map with
only common types (e.g., "Window", "HTMLDocument", "Console").

[siva, 2014/05/30 23:53:33]

If we are going to go with specialization for certain types I would prefer if we
wired them up so that we can access them from C++ code itself without having to
make a Dart call.

The cost of making a Dart call is not just limited to the class finalization it
also involves transition to Dart, parsing the code, generating m/c code and
transitioning back.

On 2014/05/28 15:07:45, vsm wrote:

-    return htmlBlinkMap[key];
+    return htmlBlinkMap[key]();
   if (indexed_dbBlinkMap.containsKey(key))
-    return indexed_dbBlinkMap[key];
+    return indexed_dbBlinkMap[key]();
   if (web_audioBlinkMap.containsKey(key))
-    return web_audioBlinkMap[key];
+    return web_audioBlinkMap[key]();
   if (web_glBlinkMap.containsKey(key))
-    return web_glBlinkMap[key];
+    return web_glBlinkMap[key]();
   if (web_sqlBlinkMap.containsKey(key))
-    return web_sqlBlinkMap[key];
+    return web_sqlBlinkMap[key]();
   if (svgBlinkMap.containsKey(key))
-    return svgBlinkMap[key];
+    return svgBlinkMap[key]();
   return null;
 }// Copyright (c) 2014, 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.
 
 
 // _Utils native entry points
 Native_Utils_window() native "Utils_window";
 
 Native_Utils_forwardingPrint(message) native "Utils_forwardingPrint";
@@ skipping 38 matching lines @@
 // _DOMStringMap native entry  points
 Native_DOMStringMap_containsKey(_DOMStringMap, key) native "DOMStringMap_containsKey_Callback";
 
 Native_DOMStringMap_item(_DOMStringMap, key) native "DOMStringMap_item_Callback";
 
 Native_DOMStringMap_setItem(_DOMStringMap, key, value) native "DOMStringMap_setItem_Callback";
 
 Native_DOMStringMap_remove(_DOMStringMap, key) native "DOMStringMap_remove_Callback";
 
 Native_DOMStringMap_get_keys(_DOMStringMap) native "DOMStringMap_getKeys_Callback";