Provide list of service protocol extensions in isolate and emit an event when one is registered

runtime/vm/service_event.h

 // Copyright (c) 2015, 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_SERVICE_EVENT_H_
 #define VM_SERVICE_EVENT_H_
 
 #include "vm/debugger.h"
 
 class DebuggerEvent;
 
 namespace dart {
 
 class ServiceEvent {
  public:
   enum EventKind {
     kVMUpdate,           // VM identity information has changed
 
     kIsolateStart,       // New isolate has started
     kIsolateRunnable,    // Isolate is ready to run
     kIsolateExit,        // Isolate has exited
     kIsolateUpdate,      // Isolate identity information has changed
 
+    kServiceExtensionAdded,  // A service extension was registered
+
     kPauseStart,         // --pause-isolates-on-start
     kPauseExit,          // --pause-isolates-on-exit
     kPauseBreakpoint,
     kPauseInterrupted,
     kPauseException,
     kResume,
     kBreakpointAdded,
     kBreakpointResolved,
     kBreakpointRemoved,
     kInspect,
@@ skipping 56 matching lines @@
     return top_frame_;
   }
   void set_top_frame(ActivationFrame* frame) {
     ASSERT(kind() == kPauseBreakpoint ||
            kind() == kPauseInterrupted ||
            kind() == kPauseException ||
            kind() == kResume);
     top_frame_ = frame;
   }
 
+  const String* extension_rpc() const {
+    return extension_rpc_;
+  }
+  void set_extension_rpc(const String* extension_rpc) {
+    extension_rpc_ = extension_rpc;
+  }
+
   const Object* exception() const {
     return exception_;
   }
   void set_exception(const Object* exception) {
     ASSERT(kind_ == kPauseException);
     exception_ = exception;
   }
 
   const Object* async_continuation() const {
     return async_continuation_;
@@ skipping 51 matching lines @@
 
   void PrintJSONHeader(JSONObject* jsobj) const;
 
  private:
   Isolate* isolate_;
   EventKind kind_;
   const char* embedder_kind_;
   const char* embedder_stream_id_;
   Breakpoint* breakpoint_;
   ActivationFrame* top_frame_;
+  const String* extension_rpc_;
   const Object* exception_;
   const Object* async_continuation_;
   bool at_async_jump_;
   const Object* inspectee_;
   const Heap::GCStats* gc_stats_;
   const uint8_t* bytes_;
   intptr_t bytes_length_;
   LogRecord log_record_;
   int64_t timestamp_;
 };
 
 }  // namespace dart
 
 #endif  // VM_SERVICE_EVENT_H_