Support for tracing app initialization.

shell/tracer.cc

 // Copyright 2015 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 "shell/tracer.h"
 
 #include <stdio.h>
 #include <string.h>
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "base/trace_event/trace_config.h"
 #include "base/trace_event/trace_event.h"
 
 namespace shell {
 
 Tracer::Tracer()
-    : tracing_(false), first_chunk_written_(false), trace_file_(nullptr) {
-}
+    : tracing_(false), first_chunk_written_(false), trace_file_(nullptr) {}
 
-Tracer::~Tracer() {
-}
+Tracer::~Tracer() {}
 
 void Tracer::Start(const std::string& categories,
                    const std::string& duration_seconds_str,
                    const std::string& filename) {
   trace_duration_secs_ = 5;
   if (!duration_seconds_str.empty()) {
     CHECK(base::StringToInt(duration_seconds_str, &trace_duration_secs_))
         << "Could not parse --trace-startup-duration value "
         << duration_seconds_str;
   }
@@ skipping 25 matching lines @@
       this, data_pipe.consumer_handle.Pass()));
 }
 
 void Tracer::StopAndFlushToFile() {
   if (tracing_)
     StopTracingAndFlushToDisk();
 }
 
 void Tracer::ConnectToProvider(
     mojo::InterfaceRequest<tracing::TraceProvider> request) {
-  auto impl = new mojo::TraceProviderImpl(request.Pass());
-  impl->set_tracing_already_started(tracing_);
+  trace_provider_impl_.Bind(request.Pass());
 }
 
 void Tracer::StopTracingAndFlushToDisk() {
   tracing_ = false;
   trace_file_ = fopen(trace_filename_.c_str(), "w+");
   PCHECK(trace_file_);
   static const char kStart[] = "{\"traceEvents\":[";
   PCHECK(fwrite(kStart, 1, strlen(kStart), trace_file_) == strlen(kStart));
 
   // At this point we might be connected to the tracing service, in which case
@@ skipping 75 matching lines @@
   WriteFooterAndClose();
 }
 
 void Tracer::WriteCommaIfNeeded() {
   if (first_chunk_written_)
     PCHECK(fwrite(",", 1, 1, trace_file_) == 1);
   first_chunk_written_ = true;
 }
 
 }  // namespace shell