Enable startup tracing from command line flags in components/tracing

content/app/android/library_loader_hooks.cc

 // Copyright (c) 2012 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/app/android/library_loader_hooks.h"
 
 #include "base/android/base_jni_registrar.h"
 #include "base/android/command_line_android.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "base/android/jni_string.h"
 #include "base/android/library_loader/library_loader_hooks.h"
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/trace_event/trace_event.h"
 #include "base/tracked_objects.h"
-#include "components/tracing/browser/trace_config_file.h"
-#include "components/tracing/common/trace_to_console.h"
-#include "components/tracing/common/tracing_switches.h"
+#include "components/tracing/common/trace_startup.h"
 #include "content/app/android/app_jni_registrar.h"
 #include "content/browser/android/browser_jni_registrar.h"
 #include "content/common/android/common_jni_registrar.h"
 #include "content/common/content_constants_internal.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/result_codes.h"
 #include "device/bluetooth/android/bluetooth_jni_registrar.h"
 #include "device/gamepad/android/gamepad_jni_registrar.h"
 #include "device/generic_sensor/android/sensors_jni_registrar.h"
 #include "device/geolocation/android/geolocation_jni_registrar.h"
@@ skipping 79 matching lines @@
     if (!ui::RegisterUIAndroidJni(env))
       return false;
 
     g_jni_init_done = true;
   }
 
   return true;
 }
 
 bool LibraryLoaded(JNIEnv* env, jclass clazz) {
-  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
-
   // Enable startup tracing asap to avoid early TRACE_EVENT calls being ignored.
-  if (command_line->HasSwitch(switches::kTraceStartup)) {
-    base::trace_event::TraceConfig trace_config(
-        command_line->GetSwitchValueASCII(switches::kTraceStartup), "");
-    base::trace_event::TraceLog::GetInstance()->SetEnabled(
-        trace_config, base::trace_event::TraceLog::RECORDING_MODE);
-  } else if (command_line->HasSwitch(switches::kTraceToConsole)) {
-      base::trace_event::TraceConfig trace_config =
-          tracing::GetConfigForTraceToConsole();
-      LOG(ERROR) << "Start " << switches::kTraceToConsole
-                 << " with CategoryFilter '"
-                 << trace_config.ToCategoryFilterString() << "'.";
-      base::trace_event::TraceLog::GetInstance()->SetEnabled(
-          trace_config,
-          base::trace_event::TraceLog::RECORDING_MODE);
-  } else if (tracing::TraceConfigFile::GetInstance()->IsEnabled()) {
-    // This checks kTraceConfigFile switch.
-    base::trace_event::TraceLog::GetInstance()->SetEnabled(
-        tracing::TraceConfigFile::GetInstance()->GetTraceConfig(),
-        base::trace_event::TraceLog::RECORDING_MODE);
-  }
+  tracing::EnableStartupTracingIfNeeded(true /* can_access_file_system */);
 
   // Android's main browser loop is custom so we set the browser
   // name here as early as possible.
   base::trace_event::TraceLog::GetInstance()->SetProcessName("Browser");
   base::trace_event::TraceLog::GetInstance()->SetProcessSortIndex(
       kTraceEventBrowserProcessSortIndex);
 
   // Can only use event tracing after setting up the command line.
   TRACE_EVENT0("jni", "JNI_OnLoad continuation");
 
   logging::LoggingSettings settings;
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   logging::InitLogging(settings);
   // To view log output with IDs and timestamps use "adb logcat -v threadtime".
   logging::SetLogItems(false,    // Process ID
                        false,    // Thread ID
                        false,    // Timestamp
                        false);   // Tick count
   VLOG(0) << "Chromium logging enabled: level = " << logging::GetMinLogLevel()
           << ", default verbosity = " << logging::GetVlogVerbosity();
 
   return true;
 }
 
 }  // namespace content