[strong] Stricter check for referring to other classes inside methods.

src/variables.h

Index: src/variables.h
diff --git a/src/variables.h b/src/variables.h
index de7f39045af934d8a7d13320f58cbc8cb88588a2..099b40a2c518f4a37f0fc592efb8d8a758ffbca3 100644
--- a/src/variables.h
+++ b/src/variables.h
@@ -49,7 +49,8 @@ class Variable: public ZoneObject {
 
   Variable(Scope* scope, const AstRawString* name, VariableMode mode, Kind kind,
            InitializationFlag initialization_flag,
-           MaybeAssignedFlag maybe_assigned_flag = kNotAssigned);
+           MaybeAssignedFlag maybe_assigned_flag = kNotAssigned,
+           int consecutive_declaration_batch_start = -1);
 
   // Printing support
   static const char* Mode2String(VariableMode mode);
@@ -74,6 +75,9 @@ class Variable: public ZoneObject {
   void set_is_used() { is_used_ = true; }
   MaybeAssignedFlag maybe_assigned() const { return maybe_assigned_; }
   void set_maybe_assigned() { maybe_assigned_ = kMaybeAssigned; }
+  int consecutive_declaration_batch_start() const {
+    return consecutive_declaration_batch_start_;
+  }
 
   int initializer_position() { return initializer_position_; }
   void set_initializer_position(int pos) { initializer_position_ = pos; }
@@ -173,6 +177,11 @@ class Variable: public ZoneObject {
   bool is_used_;
   InitializationFlag initialization_flag_;
   MaybeAssignedFlag maybe_assigned_;
+
+  // For classes and functions we keep track of consecutive batches of class /
+  // function delcarations. They are needed for strong mode scoping
+  // checks. TODO(marja, rossberg): Implement checks for functions too.
+  int consecutive_declaration_batch_start_;
 };