Make tracing work on Android

services/tracing/main.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 "mojo/application/application_runner_chromium.h"
 #include "mojo/common/weak_binding_set.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 26 matching lines @@
     coordinator_bindings_.AddBinding(this, request.Pass());
   }
 
   // mojo::InterfaceFactory<TraceDataCollector> implementation.
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<TraceDataCollector> request) override {
     collector_bindings_.AddBinding(this, request.Pass());
   }
 
   // tracing::TraceCoordinator implementation.
-  void Start(const mojo::String& base_name,
+  void Start(mojo::ScopedDataPipeProducerHandle stream,
              const mojo::String& categories) override {
-    base::FilePath base_name_path =
-        base::FilePath::FromUTF8Unsafe(base_name.To<std::string>());
-    sink_.reset(new TraceDataSink(base_name_path));
+    sink_.reset(new TraceDataSink(stream.Pass()));
     collector_bindings_.ForAllBindings([categories](
         TraceController* controller) { controller->StartTracing(categories); });
   }
   void StopAndFlush() override {
     collector_bindings_.ForAllBindings(
         [](TraceController* controller) { controller->StopTracing(); });
 
     // TODO: We really should keep track of how many connections we have here
     // and flush + reset the sink after we receive a EndTracing or a detect a
     // pipe closure on all pipes.
@@ skipping 17 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(TracingApp);
 };
 
 }  // namespace tracing
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunnerChromium runner(new tracing::TracingApp);
   return runner.Run(shell_handle);
 }