Rename Target.writeOutline() into computeOutline(), add separate KernelTarget.writeOutline().

pkg/front_end/lib/src/fasta/fasta.dart

Index: pkg/front_end/lib/src/fasta/fasta.dart
diff --git a/pkg/front_end/lib/src/fasta/fasta.dart b/pkg/front_end/lib/src/fasta/fasta.dart
index 5408965056608b5fb147bd13c3e05fd653c90000..2c39693f19c9420cedc36153c252e0df6c5e4d13 100644
--- a/pkg/front_end/lib/src/fasta/fasta.dart
+++ b/pkg/front_end/lib/src/fasta/fasta.dart
@@ -144,7 +144,8 @@ class CompileTask {
     } else {
       inputError(uri, -1, "Unexpected input: $uri");
     }
-    await dillTarget.writeOutline(null);
+    await dillTarget.computeOutline();
+    await kernelTarget.computeOutline();
     await kernelTarget.writeOutline(output);
     if (c.options.dumpIr && output != null) {
       kernelTarget.dumpIr();
@@ -193,8 +194,8 @@ Future<CompilationResult> parseScriptInFileSystem(
       final KernelTarget kernelTarget =
           new KernelTarget(fileSystem, dillTarget, uriTranslator, strongMode);
       kernelTarget.read(fileName);
-      await dillTarget.writeOutline(null);
-      program = await kernelTarget.writeOutline(null);
+      await dillTarget.computeOutline();
+      await kernelTarget.computeOutline();
       program = await kernelTarget.writeProgram(null);
       if (kernelTarget.errors.isNotEmpty) {
         return new CompilationResult.errors(kernelTarget.errors
@@ -266,7 +267,7 @@ Future writeDepsFile(Uri script, Uri depsFile, Uri output,
         dillTarget, uriTranslator, false, c.uriToSource);
 
     kernelTarget.read(script);
-    await dillTarget.writeOutline(null);
+    await dillTarget.computeOutline();
     await kernelTarget.loader.buildOutlines();
     await kernelTarget.writeDepsFile(output, depsFile,
         extraDependencies: extraDependencies);