arc: enable Android tracing in verified-boot mode

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index 4b3e12bfb9ce489d6a0d4c315c4bd49d8ae48382..ad9458214b3b442967a7df6d8522668e0d1369e5 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -35,6 +35,7 @@
 #include "chrome/browser/chromeos/app_mode/kiosk_app_manager.h"
 #include "chrome/browser/chromeos/app_mode/kiosk_mode_idle_app_name_notification.h"
 #include "chrome/browser/chromeos/arc/arc_service_launcher.h"
+#include "chrome/browser/chromeos/arc/trace/arc_trace_bridge.h"
 #include "chrome/browser/chromeos/boot_times_recorder.h"
 #include "chrome/browser/chromeos/dbus/chrome_console_service_provider_delegate.h"
 #include "chrome/browser/chromeos/dbus/chrome_display_power_service_provider_delegate.h"
@@ -109,6 +110,7 @@
 #include "chromeos/cryptohome/cryptohome_parameters.h"
 #include "chromeos/cryptohome/homedir_methods.h"
 #include "chromeos/cryptohome/system_salt_getter.h"
+#include "chromeos/dbus/arc_trace_agent.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/power_policy_controller.h"
 #include "chromeos/dbus/services/console_service_provider.h"
@@ -429,6 +431,10 @@ void ChromeBrowserMainPartsChromeos::PreMainMessageLoopRun() {
   arc_service_launcher_.reset(new arc::ArcServiceLauncher());
   arc_service_launcher_->Initialize();
 
+  // Initialize dbus ArgTraceAgent by setting ArcTraceBridge.

[Luis Héctor Chávez, 2016/12/27 19:15:59]

nit: s/ArgTraceAgent/ArcTraceAgent/

Also, this comment is just describing the very next line (instead of describing
why it's doing so), so maybe drop it?

[shunhsingou, 2016/12/28 09:15:15]

Done.

+  DBusThreadManager::Get()->GetArcTraceAgent()->SetArcTraceBridge(
+      arc::ArcTraceBridge::Get());
+
   chromeos::ResourceReporter::GetInstance()->StartMonitoring(
       task_manager::TaskManagerInterface::GetTaskManager());