Add support for profile-based startup optimizations.

pkg/compiler/lib/src/js_emitter/model.dart

Index: pkg/compiler/lib/src/js_emitter/model.dart
diff --git a/pkg/compiler/lib/src/js_emitter/model.dart b/pkg/compiler/lib/src/js_emitter/model.dart
index e0a8fda68e242fc7a187b34cbe0375f2b2bb86f1..3df86b844422fbf37d09cf3f9aec5ffc0b6b9d5d 100644
--- a/pkg/compiler/lib/src/js_emitter/model.dart
+++ b/pkg/compiler/lib/src/js_emitter/model.dart
@@ -16,6 +16,7 @@ class Program {
   final bool outputContainsConstantList;
   final bool needsNativeSupport;
   final bool hasIsolateSupport;
+  final bool hasSoftDeferredClasses;
 
   /// A map from load id to the list of fragments that need to be loaded.
   final Map<String, List<Fragment>> loadMap;
@@ -38,7 +39,8 @@ class Program {
       this.typeToInterceptorMap, this._metadataCollector, this.finalizers,
       {this.needsNativeSupport,
       this.outputContainsConstantList,
-      this.hasIsolateSupport}) {
+      this.hasIsolateSupport,
+      this.hasSoftDeferredClasses}) {
     assert(needsNativeSupport != null);
     assert(outputContainsConstantList != null);
     assert(hasIsolateSupport != null);
@@ -232,6 +234,11 @@ class Class implements FieldContainer {
   final bool isNative;
   final bool isClosureBaseClass; // Common base class for closures.
 
+  /// Whether this class should be soft deferred.
+  ///
+  /// A soft-deferred class is only fully initialized at first instantiation.
+  final bool isSoftDeferred;
+
   // If the class implements a function type, and the type is encoded in the
   // metatada table, then this field contains the index into that field.
   final js.Expression functionTypeIndex;
@@ -264,7 +271,8 @@ class Class implements FieldContainer {
       this.onlyForRti,
       this.isDirectlyInstantiated,
       this.isNative,
-      this.isClosureBaseClass}) {
+      this.isClosureBaseClass,
+      this.isSoftDeferred = false}) {
     assert(onlyForRti != null);
     assert(isDirectlyInstantiated != null);
     assert(isNative != null);