Create and test source mapping for invocations.

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 395f45594ba95731a008995de43a63319e9d7615..f6fd6f43fe11733018652dadc88e982206c29c7e 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
@@ -29,7 +29,7 @@ typedef void IrBuilderCallback(Element element, ir.FunctionDefinition irNode);
 /// This class is mainly there to correctly measure how long building the IR
 /// takes.
 class IrBuilderTask extends CompilerTask {
-  final SourceInformationFactory sourceInformationFactory;
+  final SourceInformationStrategy sourceInformationStrategy;
 
   String bailoutMessage = null;
 
@@ -37,7 +37,7 @@ class IrBuilderTask extends CompilerTask {
   /// [ir.FunctionDefinition] node that has been built.
   IrBuilderCallback builderCallback;
 
-  IrBuilderTask(Compiler compiler, this.sourceInformationFactory,
+  IrBuilderTask(Compiler compiler, this.sourceInformationStrategy,
       [this.builderCallback])
       : super(compiler);
 
@@ -51,7 +51,7 @@ class IrBuilderTask extends CompilerTask {
       element = element.implementation;
       return compiler.withCurrentElement(element, () {
         SourceInformationBuilder sourceInformationBuilder =
-            sourceInformationFactory.forContext(element);
+            sourceInformationStrategy.createBuilderForContext(element);
 
         IrBuilderVisitor builder =
             new JsIrBuilderVisitor(
@@ -1004,7 +1004,8 @@ abstract class IrBuilderVisitor extends ast.Visitor<ir.Primitive>
     }
     return irBuilder.buildStaticFunctionInvocation(function, callStructure,
         translateStaticArguments(arguments, function, callStructure),
-        sourceInformation: sourceInformationBuilder.buildCall(node));
+        sourceInformation: sourceInformationBuilder.buildCall(
+            node, node.selector));
   }
 
   @override