[Tracing Clock Sync] Add TracingAgent interface in Chrome

chromeos/dbus/fake_debug_daemon_client.cc

Index: chromeos/dbus/fake_debug_daemon_client.cc
diff --git a/chromeos/dbus/fake_debug_daemon_client.cc b/chromeos/dbus/fake_debug_daemon_client.cc
index 8dd391cdbb9d549a81a4ee2f29b5a01a9a8763d9..8594d4358cef0a1e3999926d70e1dbabf3fe89e8 100644
--- a/chromeos/dbus/fake_debug_daemon_client.cc
+++ b/chromeos/dbus/fake_debug_daemon_client.cc
@@ -38,16 +38,30 @@ void FakeDebugDaemonClient::SetDebugMode(const std::string& subsystem,
                                          const SetDebugModeCallback& callback) {
   callback.Run(false);
 }
-void FakeDebugDaemonClient::StartSystemTracing() {}
 
-bool FakeDebugDaemonClient::RequestStopSystemTracing(
-    scoped_refptr<base::TaskRunner> task_runner,
-    const StopSystemTracingCallback& callback) {
-  std::string no_data;
-  callback.Run(base::RefCountedString::TakeString(&no_data));
+std::string FakeDebugDaemonClient::GetTracingAgentName() {
+  return kCrOSTracingAgentName;
+}
+
+std::string FakeDebugDaemonClient::GetTraceEventLabel() {
+  return kSystemTraceLabel;
+}
+
+bool FakeDebugDaemonClient::StartAgentTracing(
+    const base::trace_event::TraceConfig& trace_config) {
   return true;
 }
 
+void FakeDebugDaemonClient::StopAgentTracing(
+    const StopAgentTracingCallback& callback) {
+  std::string no_data;
+  callback.Run(GetTracingAgentName(), GetTraceEventLabel(),
+               base::RefCountedString::TakeString(&no_data));
+}
+
+void FakeDebugDaemonClient::SetStopAgentTracingTaskRunner(
+    scoped_refptr<base::TaskRunner> task_runner) {}
+
 void FakeDebugDaemonClient::GetRoutes(bool numeric,
                                       bool ipv6,
                                       const GetRoutesCallback& callback) {