Enable startup tracing from command line flags in components/tracing

components/tracing/common/trace_config_file.cc

 // Copyright (c) 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 "components/tracing/browser/trace_config_file.h"
+#include "components/tracing/common/trace_config_file.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/logging.h"
@@ skipping 18 matching lines @@
 #endif
 
 const base::FilePath::CharType kDefaultResultFile[] =
     FILE_PATH_LITERAL("chrometrace.log");
 
 // String parameters that can be used to parse the trace config file content.
 const char kTraceConfigParam[] = "trace_config";
 const char kStartupDurationParam[] = "startup_duration";
 const char kResultFileParam[] = "result_file";
 
-} // namespace
+}  // namespace
 
 TraceConfigFile* TraceConfigFile::GetInstance() {
   return base::Singleton<TraceConfigFile,
                          base::DefaultSingletonTraits<TraceConfigFile>>::get();
 }
 
 TraceConfigFile::TraceConfigFile()
     : is_enabled_(false),
       trace_config_(base::trace_event::TraceConfig()),
       startup_duration_(0),
@@ skipping 31 matching lines @@
                                          &trace_config_file_content,
                                          kTraceConfigFileSizeLimit)) {
     DLOG(WARNING) << "Cannot read the trace config file correctly.";
     return;
   }
   is_enabled_ = ParseTraceConfigFileContent(trace_config_file_content);
   if (!is_enabled_)
     DLOG(WARNING) << "Cannot parse the trace config file correctly.";
 }
 
-TraceConfigFile::~TraceConfigFile() {
-}
+TraceConfigFile::~TraceConfigFile() {}
 
 bool TraceConfigFile::ParseTraceConfigFileContent(const std::string& content) {
   std::unique_ptr<base::Value> value(base::JSONReader::Read(content));
   if (!value || !value->IsType(base::Value::Type::DICTIONARY))
     return false;
 
   std::unique_ptr<base::DictionaryValue> dict(
       static_cast<base::DictionaryValue*>(value.release()));
 
   base::DictionaryValue* trace_config_dict = NULL;
   if (!dict->GetDictionary(kTraceConfigParam, &trace_config_dict))
     return false;
 
   trace_config_ = base::trace_event::TraceConfig(*trace_config_dict);
 
   if (!dict->GetInteger(kStartupDurationParam, &startup_duration_))
-      startup_duration_ = 0;
+    startup_duration_ = 0;
 
   if (startup_duration_ < 0)
-      startup_duration_ = 0;
+    startup_duration_ = 0;
 
   base::FilePath::StringType result_file_str;
   if (dict->GetString(kResultFileParam, &result_file_str))
     result_file_ = base::FilePath(result_file_str);
 
   return true;
 }
 
 bool TraceConfigFile::IsEnabled() const {
   return is_enabled_;
@@ skipping 10 matching lines @@
 }
 
 #if !defined(OS_ANDROID)
 base::FilePath TraceConfigFile::GetResultFile() const {
   DCHECK(IsEnabled());
   return result_file_;
 }
 #endif
 
 }  // namespace tracing