Add an API function to get a debugger stack trace from an error handle.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index c71a03535586d08b6717a093fcff55f75abcd6f2..1ebef90d3c0677ae6ee8e516e4fa98b463b08a89 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -27849,13 +27849,13 @@ class Url extends NativeFieldWrapperClass2 {
     if ((blob_OR_source_OR_stream is Blob || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_1(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 _createObjectURL_2(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 _WebKitMediaSource || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_3(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is _WebKitMediaSource || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is MediaStream || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_4(blob_OR_source_OR_stream);
     }
     throw new ArgumentError("Incorrect number or type of arguments");
@@ -35961,24 +35961,6 @@ class _Utils {
     return result;
   }
 
-  static List parseStackTrace(StackTrace stackTrace) {
-    final regExp = new RegExp(r'#\d\s+(.*) \((.*):(\d+):(\d+)\)');
-    List result = [];
-    for (var match in regExp.allMatches(stackTrace.toString())) {
-      result.add([match.group(1), match.group(2), int.parse(match.group(3)), int.parse(match.group(4))]);
-    }
-    return result;
-  }
-
-  static List captureParsedStackTrace() {
-    try {
-      // Throwing an exception is the only way to generate a stack trace.
-      throw new Exception();
-    } catch (e, stackTrace) {
-      return parseStackTrace(stackTrace);
-    }
-  }
-
   static void populateMap(Map result, List list) {
     for (int i = 0; i < list.length; i += 2) {
       result[list[i]] = list[i + 1];