metricsd: Create a brillo::MessageLoop.

brillo::BinderWatcher now requires a brillo::MessageLoop, so this patch
creates a brillo::BaseMessageLoop and passes it when creating the
brillo::BinderWatcher.

Bug: 26356682
TEST=Deployed metricsd to edison-eng.

Change-Id: I6a9e592623faf231205ae44e479bec2b873b8898
diff --git a/metricsd/uploader/metricsd_service_runner.cc b/metricsd/uploader/metricsd_service_runner.cc
index 5a759d3..4361cac 100644
--- a/metricsd/uploader/metricsd_service_runner.cc
+++ b/metricsd/uploader/metricsd_service_runner.cc
@@ -20,6 +20,7 @@
 
 #include <binder/IServiceManager.h>
 #include <brillo/binder_watcher.h>
+#include <brillo/message_loops/base_message_loop.h>
 #include <utils/Errors.h>
 
 #include "uploader/bn_metricsd_impl.h"
@@ -40,15 +41,17 @@
   CHECK(status == android::OK) << "Metricsd service registration failed";
 
   message_loop_for_io_.reset(new base::MessageLoopForIO);
+  message_loop_.reset(new brillo::BaseMessageLoop(message_loop_for_io_.get()));
 
-  brillo::BinderWatcher watcher;
+  brillo::BinderWatcher watcher(message_loop_.get());
   CHECK(watcher.Init()) << "failed to initialize the binder file descriptor "
                         << "watcher";
 
-  message_loop_for_io_->Run();
+  message_loop_->Run();
 
   // Delete the message loop here as it needs to be deconstructed in the thread
   // it is attached to.
+  message_loop_.reset();
   message_loop_for_io_.reset();
 }
 
diff --git a/metricsd/uploader/metricsd_service_runner.h b/metricsd/uploader/metricsd_service_runner.h
index 1715de0..f5dad21 100644
--- a/metricsd/uploader/metricsd_service_runner.h
+++ b/metricsd/uploader/metricsd_service_runner.h
@@ -21,6 +21,7 @@
 #include <thread>
 
 #include <base/message_loop/message_loop.h>
+#include <brillo/message_loops/message_loop.h>
 
 #include "uploader/crash_counters.h"
 
@@ -39,6 +40,7 @@
   void Run();
 
   std::unique_ptr<base::MessageLoopForIO> message_loop_for_io_;
+  std::unique_ptr<brillo::MessageLoop> message_loop_;
 
   std::unique_ptr<std::thread> thread_;
   std::shared_ptr<CrashCounters> counters_;