[Tracing] Add metadata filter

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/cpu.h"
 #include "base/files/file_util.h"
 #include "base/json/string_escape.h"
 #include "base/macros.h"
@@ skipping 266 matching lines @@
   }
 
   if (!callback.is_null())
     callback.Run();
 }
 
 bool TracingControllerImpl::StopTracing(
     const scoped_refptr<TraceDataSink>& trace_data_sink) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
-  if (trace_data_sink)
+  if (trace_data_sink) {
+    if (TraceLog::GetInstance()->GetCurrentTraceConfig()
+        .IsArgumentFilterEnabled()) {
+      trace_data_sink->EnableMetadataFilter();
+    }
     trace_data_sink->AddMetadata(*GenerateTracingMetadataDict().get());
+  }
 
   if (!can_stop_tracing())
     return false;
 
   trace_data_sink_ = trace_data_sink;
   // Disable local trace early to avoid traces during end-tracing process from
   // interfering with the process.
   base::Closure on_stop_tracing_done_callback = base::Bind(
       &TracingControllerImpl::OnStopTracingDone, base::Unretained(this));
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
@@ skipping 744 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