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

mojo/common/tracing_impl.h

Index: mojo/common/tracing_impl.h
diff --git a/mojo/common/tracing_impl.h b/mojo/common/tracing_impl.h
index d3f93c6426d47c2ec829a74d63c6b8d9d0e89453..95c44eaefab345ab6196f2ff1ea9635ab893c7b5 100644
--- a/mojo/common/tracing_impl.h
+++ b/mojo/common/tracing_impl.h
@@ -5,12 +5,15 @@
 #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:
@@ -18,8 +21,10 @@ class 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_;