Allows turning on checked mode on a per-isolate basis

runtime/vm/isolate.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/base_isolate.h"
@@ skipping 339 matching lines @@
   Mutex* mutex() const { return mutex_; }
 
   Debugger* debugger() const { return debugger_; }
 
   void set_single_step(bool value) { single_step_ = value; }
   bool single_step() const { return single_step_; }
   static intptr_t single_step_offset() {
     return OFFSET_OF(Isolate, single_step_);
   }
 
+  void set_checked_mode(bool value) { checked_mode_ = value; }
+  bool checked_mode() const { return checked_mode_; }
+
   // Requests that the debugger resume execution.
   void Resume() {
     resume_request_ = true;
   }
 
   // Returns whether the vm service has requested that the debugger
   // resume execution.
   bool GetAndClearResumeRequest() {
     bool resume_request = resume_request_;
     resume_request_ = false;
@@ skipping 272 matching lines @@
   ObjectStore* object_store_;
   uword top_exit_frame_info_;
   void* init_callback_data_;
   Dart_EnvironmentCallback environment_callback_;
   Dart_LibraryTagHandler library_tag_handler_;
   ApiState* api_state_;
   StubCode* stub_code_;
   Debugger* debugger_;
   bool single_step_;
   bool resume_request_;
+  bool checked_mode_;
   Random random_;
   Simulator* simulator_;
   LongJumpScope* long_jump_base_;
   TimerList timer_list_;
   intptr_t deopt_id_;
   Mutex* mutex_;  // protects stack_limit_ and saved_stack_limit_.
   uword stack_limit_;
   uword saved_stack_limit_;
   uword stack_base_;
   uword stack_overflow_flags_;
@@ skipping 200 matching lines @@
   uint8_t* serialized_args_;
   intptr_t serialized_args_len_;
   uint8_t* serialized_message_;
   intptr_t serialized_message_len_;
   bool paused_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_