Add new EpollController class.

The class is a thin wrapper for C epoll functions.

Bug: 34903085
Test: Build EpollController.cc and libappfuse_test after applying
      future changes locally.

Change-Id: Iedce7f35e4397f80cde1054d53261ad94f9e58a8
diff --git a/libappfuse/Android.bp b/libappfuse/Android.bp
index f729faf..0d57814 100644
--- a/libappfuse/Android.bp
+++ b/libappfuse/Android.bp
@@ -19,6 +19,7 @@
         "FuseAppLoop.cc",
         "FuseBuffer.cc",
         "FuseBridgeLoop.cc",
+        "EpollController.cc",
     ]
 }