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

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart
index 0cd99deb25ede32deddefeeab3f04b0104a96b8e..2d48a09e939346e5fcdf782a9235a0b80db1a78f 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart
@@ -89,6 +89,25 @@ final global_ = JS(
         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 : {};