Support configuring DDC runtime settings before the application starts and normalize API for config…

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart

 // Copyright (c) 2015, 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.
 
 library dart._runtime;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'dart:_debugger' show stackTraceMapper;
@@ skipping 71 matching lines @@
       if (typeof Animation == "undefined") {
         let d = document.createElement('div');
         if (typeof d.animate != "undefined") {
           window.Animation = d.animate(d).constructor;
         }
       }
       if (typeof SourceBufferList == "undefined") {
         window.SourceBufferList = new MediaSource().sourceBuffers.constructor;
       }
     }
+
+    // These settings must be configured before the application starts so that

[vsm, 2017/05/10 16:42:05]

Might be worth moving the globalState decl above this and using globalState
instead of window (for some glorious node future).

[Jacob, 2017/05/10 17:05:26]

Good point. Done.

+    // user code runs with the correct configuration.
+    if ('ddcSettings' in window) {
+      let settings = window.ddcSettings;
+      if ('trapRuntimeErrors' in settings) {
+        $trapRuntimeErrors(settings.trapRuntimeErrors);
+      }
+      if ('ignoreWhitelistedErrors' in settings) {
+        $ignoreWhitelistedErrors(settings.ignoreWhitelistedErrors);
+      }
+      if ('failForWeakModeIsChecks' in settings) {
+        $failForWeakModeIsChecks(settings.failForWeakModeIsChecks);
+      }
+      if ('trackProfile' in settings) {
+        $trackProfile(settings.trackProfile);
+      }
+    }
+
     var globalState = (typeof window != "undefined") ? window
       : (typeof global != "undefined") ? global
       : (typeof self != "undefined") ? self : {};
     return globalState;
   }()
 ''');
 
 final JsSymbol = JS('', 'Symbol');