Show flags in Observatory.

runtime/vm/flags.h

 // Copyright (c) 2012, 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_FLAGS_H_
 #define VM_FLAGS_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 
@@ skipping 18 matching lines @@
   DEFINE_FLAG(type, name, default_value, comment)
 #else
 #define DECLARE_DEBUG_FLAG(type, name)
 #define DEFINE_DEBUG_FLAG(type, name, default_value, comment)
 #endif
 
 namespace dart {
 
 typedef void (*FlagHandler)(bool value);
 
-// Forward declaration.
+// Forward declarations.
 class Flag;
+class JSONArray;
+class JSONStream;
 
 class Flags {
  public:
   static bool Register_bool(bool* addr,
                             const char* name,
                             bool default_value,
                             const char* comment);
 
   static int Register_int(int* addr,
                           const char* name,
                           int default_value,
                           const char* comment);
 
   static const char* Register_charp(charp* addr,
                                     const char* name,
                                     const char* default_value,
                                     const char* comment);
 
   static bool Register_func(FlagHandler handler,
                             const char* name,
                             const char* comment);
 
   static bool ProcessCommandLineFlags(int argc, const char** argv);
 
   static Flag* Lookup(const char* name);
 
   static bool Initialized() { return initialized_; }
 
+  static void PrintJSON(JSONStream* js);
+
+  static bool SetFlag(const char* name,
+                      const char* value,
+                      const char** error);
+
  private:
-  static Flag* flags_;
+  static Flag** flags_;
+  static intptr_t capacity_;
+  static intptr_t num_flags_;
 
   static bool initialized_;
 
+  static void AddFlag(Flag* flag);
+
+  static bool SetFlagFromString(Flag* flag, const char* argument);
+
   static void Parse(const char* option);
 
   static int CompareFlagNames(const void* left, const void* right);
 
   static void PrintFlags();
 
+  static void PrintFlagToJSONArray(JSONArray* jsarr, const Flag* flag);
+
   // Testing needs direct access to private methods.
   friend void Dart_TestParseFlags();
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Flags);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLAGS_H_