Tweak public APIs and use them in patch_sdk, dart2js, and kernel-service

pkg/front_end/test/subpackage_relationships_test.dart

Index: pkg/front_end/test/subpackage_relationships_test.dart
diff --git a/pkg/front_end/test/subpackage_relationships_test.dart b/pkg/front_end/test/subpackage_relationships_test.dart
index 43a664c5c55506536ae2c0f616d19c02a19b0164..e68a3ae03b1eb6d5f7f1ba0824aaae3052aacb57 100644
--- a/pkg/front_end/test/subpackage_relationships_test.dart
+++ b/pkg/front_end/test/subpackage_relationships_test.dart
@@ -41,10 +41,7 @@ final subpackageRules = {
   'lib': new SubpackageRules(allowedDependencies: [
     'lib/src',
     'lib/src/base',
-    'lib/src/fasta',
-    'lib/src/fasta/dill',
-    'lib/src/fasta/kernel',
-    'lib/src/incremental'
+    'lib/src/incremental',
   ]),
   'lib/src': new SubpackageRules(allowedDependencies: [
     'lib',
@@ -64,6 +61,8 @@ final subpackageRules = {
   'lib/src/codegen': new SubpackageRules(),
   'lib/src/fasta': new SubpackageRules(allowedDependencies: [
     'lib',
+    'lib/src',
+    'lib/src/base',
     'lib/src/fasta/builder',
     'lib/src/fasta/dill',
     'lib/src/fasta/kernel',
@@ -122,6 +121,7 @@ final subpackageRules = {
     'lib/src/scanner',
   ]),
   'lib/src/fasta/testing': new SubpackageRules(allowedDependencies: [
+    'lib',
     'lib/src/fasta',
     'lib/src/base',
     'lib/src/fasta/kernel',
@@ -153,6 +153,7 @@ final subpackageRules = {
   ]),
   'lib/src/testing': new SubpackageRules(allowedDependencies: [
     'lib',
+    'lib/src/fasta/testing',
   ]),
 };