Move dart_debugger into tonic and use it in mojo dart controller

tonic/dart_debugger.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "mojo/dart/embedder/dart_debugger.h"
+#include "tonic/dart_debugger.h"
+
 #include "dart/runtime/include/dart_api.h"
 #include "dart/runtime/include/dart_native_api.h"
 #include "dart/runtime/include/dart_tools_api.h"
 
 
-namespace mojo {
-namespace dart {
+namespace tonic {
+
+MonitorLocker::~MonitorLocker() {
+  monitor_->Exit();
+}
 
 void DartDebuggerIsolate::MessageLoop() {
   MonitorLocker ml(&monitor_);
   // Request notification on isolate messages.  This allows us to
   // respond to vm service messages while at breakpoint.
   Dart_SetMessageNotifyCallback(DartDebugger::NotifyIsolate);
   while (true) {
     // Handle all available vm service messages, up to a resume
     // request.
     bool resume = false;
@@ skipping 105 matching lines @@
       return;
     }
   }
   NOTREACHED();
 }
 
 base::Lock* DartDebugger::lock_ = nullptr;
 std::vector<std::unique_ptr<DartDebuggerIsolate>>* DartDebugger::isolates_ =
     nullptr;
 
-}  // namespace dart
-}  // namespace mojo
+}  // namespace tonic