Hide kernel isolate from isolate list; do not register it either

runtime/vm/kernel_isolate.cc

 // Copyright (c) 2016, 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.
 
 #include "vm/kernel_isolate.h"
 
 #include "vm/compiler.h"
 #include "include/dart_native_api.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 15 matching lines @@
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 
 #define Z (T->zone())
 
 DEFINE_FLAG(bool, trace_kernel, false, "Trace Kernel service requests.");
 DEFINE_FLAG(bool,
             use_dart_frontend,
             false,
             "Parse scripts with Dart-to-Kernel parser");
+DEFINE_FLAG(bool,
+            show_kernel_isolate,
+            false,
+            "Show Kernel service isolate as normal isolate.");
 
 const char* KernelIsolate::kName = DART_KERNEL_ISOLATE_NAME;
 Dart_IsolateCreateCallback KernelIsolate::create_callback_ = NULL;
 Monitor* KernelIsolate::monitor_ = new Monitor();
 Isolate* KernelIsolate::isolate_ = NULL;
 bool KernelIsolate::initializing_ = true;
 Dart_Port KernelIsolate::kernel_port_ = ILLEGAL_PORT;
 
 
 class RunKernelTask : public ThreadPool::Task {
@@ skipping 387 matching lines @@
   }
 
   KernelCompilationRequest request;
   return request.SendAndWaitForResponse(kernel_port, script_uri);
 }
 
 
 #endif  // DART_PRECOMPILED_RUNTIME
 
 }  // namespace dart