Move tracing_impl code to mojo/common

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/common/tracing.mojom.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "sky/tools/debugger/debugger.mojom.h"
-#include "sky/viewer/services/tracing.mojom.h"
 #include <iostream>
 
 namespace sky {
 namespace debugger {
 namespace {
 
 std::string GetCommand() {
   std::cout << "(skydb) ";
   std::cout.flush();
 
@@ skipping 118 matching lines @@
       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_;
+  mojo::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);
 }