Add granular file tracing.

content/browser/tracing/tracing_controller_impl.cc

 // Copyright (c) 2013 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 "content/browser/tracing/tracing_controller_impl.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/json/string_escape.h"
 #include "base/macros.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 39 matching lines @@
       pending_memory_dump_ack_count_(0),
       failed_memory_dump_count_(0),
     // Tracing may have been enabled by ContentMainRunner if kTraceStartup
     // is specified in command line.
 #if defined(OS_CHROMEOS) || defined(OS_WIN)
       is_system_tracing_(false),
 #endif
       is_recording_(TraceLog::GetInstance()->IsEnabled()),
       is_monitoring_(false) {
   base::trace_event::MemoryDumpManager::GetInstance()->SetDelegate(this);
+  base::FileTracing::g_provider = &file_tracing_provider_;
 }
 
 TracingControllerImpl::~TracingControllerImpl() {
   // This is a Leaky instance.
   NOTREACHED();
 }
 
 TracingControllerImpl* TracingControllerImpl::GetInstance() {
   return g_controller.Pointer();
 }
@@ skipping 800 matching lines @@
   is_monitoring_ = is_monitoring;
 #if !defined(OS_ANDROID)
   for (std::set<TracingUI*>::iterator it = tracing_uis_.begin();
        it != tracing_uis_.end(); it++) {
     (*it)->OnMonitoringStateChanged(is_monitoring);
   }
 #endif
 }
 
 }  // namespace content