cpsir: implementation of jsinterop in cps ir

pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart

Index: pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
index 3ae2c1bd8b306e4d385366a8cd3a4fd3465aa8bd..8876a7e0cf274ef1fd45a6bc9267c20968f84e65 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
@@ -796,7 +796,10 @@ class IrBuilderVisitor extends ast.Visitor<ir.Primitive>
 
   /// Creates a primitive for the default value of [parameter].
   ir.Primitive translateDefaultValue(ParameterElement parameter) {
-    if (parameter.initializer == null) {
+    if (parameter.initializer == null ||
+        // TODO(sigmund): revisit whether js-interop should omit default values
+        // on purpose (Issue #25759).

[Jacob, 2016/02/11 17:54:33]

Change comment to 
JS interop does not allow default values as JS does not support default values.
Lets trust that we have proper compile time errors for this.

[Siggi Cherem (dart-lang), 2016/02/11 21:16:53]

Done.

+        backend.isJsInterop(parameter.functionDeclaration)) {
       return irBuilder.buildNullConstant();
     } else {
       return inlineConstant(parameter.executableContext, parameter.initializer);
@@ -3921,4 +3924,22 @@ class GlobalProgramInformation {
   void addNativeMethod(FunctionElement function) {
     _backend.emitter.nativeEmitter.nativeMethods.add(function);
   }
+
+  bool get trustJSInteropTypeAnnotations =>
+      _compiler.trustJSInteropTypeAnnotations;
+
+  bool isNative(ClassElement element) => _backend.isNative(element);
+
+  bool isJsInterop(FunctionElement element) => _backend.isJsInterop(element);
+
+  bool isJsInteropAnonymous(FunctionElement element) =>
+    _backend.jsInteropAnalysis.hasAnonymousAnnotation(element.contextClass);
+
+  String getJsInteropTargetPath(FunctionElement element) {
+    return '${_backend.namer.fixedBackendPath(element)}.'
+      '${_backend.getFixedBackendName(element)}';
+  }
+
+  DartType get jsJavascriptObjectType =>
+    _backend.helpers.jsJavaScriptObjectClass.thisType;
 }