Make TracingImpl take a Shell* and args, instead of an ApplicationImpl*.

mojo/common/tracing_impl.h

 // 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.
 
 #ifndef MOJO_COMMON_TRACING_IMPL_H_
 #define MOJO_COMMON_TRACING_IMPL_H_
 
+#include <string>
+#include <vector>
+
 #include "base/macros.h"
 #include "mojo/common/trace_provider_impl.h"
 
 namespace mojo {
 
-class ApplicationImpl;
+class Shell;
 
 class TracingImpl {
  public:
   TracingImpl();
   ~TracingImpl();
 
   // This connects to the tracing service and registers ourselves to provide
-  // tracing data on demand.
-  void Initialize(ApplicationImpl* app);
+  // tracing data on demand. |shell| will not be stored (so it need only be
+  // valid for this call). |args| may be null, but if not should typically point
+  // to the applications "command line".
+  void Initialize(Shell* shell, const std::vector<std::string>* args);
 
  private:
   TraceProviderImpl provider_impl_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingImpl);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_COMMON_TRACING_IMPL_H_