components: Introduce AlarmTimer class and use it for GCM heartbeat

google_apis/gcm/tools/mcs_probe.cc

Index: google_apis/gcm/tools/mcs_probe.cc
diff --git a/google_apis/gcm/tools/mcs_probe.cc b/google_apis/gcm/tools/mcs_probe.cc
index cbee95fdeded2a3decf2126660556f3da99fedc1..b0b8c32c1779766199e01c50cbd0e5aa6b3ba65a 100644
--- a/google_apis/gcm/tools/mcs_probe.cc
+++ b/google_apis/gcm/tools/mcs_probe.cc
@@ -22,6 +22,7 @@
 #include "base/threading/thread.h"
 #include "base/threading/worker_pool.h"
 #include "base/time/default_clock.h"
+#include "base/timer/timer.h"
 #include "base/values.h"
 #include "google_apis/gcm/base/fake_encryptor.h"
 #include "google_apis/gcm/base/mcs_message.h"
@@ -304,7 +305,9 @@ void MCSProbe::Start() {
                                   &clock_,
                                   connection_factory_.get(),
                                   gcm_store_.get(),
-                                  &recorder_));
+                                  &recorder_,
+                                  make_scoped_ptr(new base::Timer(true,
+                                                                  false))));
   run_loop_.reset(new base::RunLoop());
   gcm_store_->Load(base::Bind(&MCSProbe::LoadCallback,
                               base::Unretained(this)));