Modify blink type map to finalize lazily

sdk/lib/_blink/dartium/_blink_dartium.dart

Index: sdk/lib/_blink/dartium/_blink_dartium.dart
diff --git a/sdk/lib/_blink/dartium/_blink_dartium.dart b/sdk/lib/_blink/dartium/_blink_dartium.dart
index 06f74ffcd5a1c6d889aa09c42f5b0d203a7c9d37..b7d22a8811b5428cd3eae37a92db8f20c22c106e 100644
--- a/sdk/lib/_blink/dartium/_blink_dartium.dart
+++ b/sdk/lib/_blink/dartium/_blink_dartium.dart
@@ -7186,10 +7186,10 @@ 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");
@@ -7197,9 +7197,9 @@ Native_URL_createObjectUrl(blob_OR_source_OR_stream) {
 
 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";
 
@@ -8298,17 +8298,17 @@ Native_XSLTProcessor_transformToFragment_Callback(mthis, source, docVal) native
 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