Bring skydebugger closer to clean-shutdown

sky/tools/debugger/prompt/prompt.cc

 // Copyright 2014 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 "base/bind.h"
 #include "base/memory/weak_ptr.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
@@ skipping 114 matching lines @@
   void Inspect() {
     debugger_->InjectInspector();
     std::cout
       << "Open the following URL in Chrome:" << std::endl
       << "chrome-devtools://devtools/bundled/devtools.html?ws=localhost:9898"
       << std::endl;
   }
 
   void Quit() {
     std::cout << "quitting" << std::endl;
-    exit(0);
+    debugger_->Shutdown();
   }
 
   void ToggleTracing() {
     if (is_tracing_) {
       std::cout << "Stopping trace (writing to sky_viewer.trace)" << std::endl;
       tracing_->Stop();
     } else {
       std::cout << "Starting trace (type 'trace' to stop tracing)" << std::endl;
       tracing_->Start();
     }
     is_tracing_ = !is_tracing_;
   }
 
   bool is_tracing_;
   DebuggerPtr debugger_;
   TracingPtr tracing_;
   std::string url_;
   base::WeakPtrFactory<Prompt> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Prompt);
 };
 
 }  // namespace debugger
 }  // namespace sky
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunnerChromium runner(new sky::debugger::Prompt);
   return runner.Run(shell_handle);
 }