Various caches for incremental compilation.

dart/sdk/lib/_internal/compiler/implementation/compiler.dart

Index: dart/sdk/lib/_internal/compiler/implementation/compiler.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/compiler.dart b/dart/sdk/lib/_internal/compiler/implementation/compiler.dart
index e0b01b2b8b04882bb2994123d4d6eb7e21118a0c..f281267de91bd8bda0ed29724d23e87a168d379d 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/compiler.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/compiler.dart
@@ -601,6 +601,10 @@ abstract class Compiler implements DiagnosticListener {
 
   final bool suppressWarnings;
 
+  /// If `true`, some values are cached for reuse in incremental compilation.
+  /// Incremental compilation is basically calling [run] more than once.
+  final bool hasIncrementalSupport;
+
   api.CompilerOutputProvider outputProvider;
 
   bool disableInlining = false;
@@ -841,6 +845,7 @@ abstract class Compiler implements DiagnosticListener {
             this.showPackageWarnings: false,
             this.useContentSecurityPolicy: false,
             this.suppressWarnings: false,
+            this.hasIncrementalSupport: false,
             outputProvider,
             List<String> strips: const []})
       : this.disableTypeInferenceFlag =