Add the new file to bazel BUILD file
diff --git a/BUILD b/BUILD
index 2bcd81a..4dc57f97 100644
--- a/BUILD
+++ b/BUILD
@@ -308,8 +308,8 @@
     srcs = [
         "src/core/lib/profiling/basic_timers.c",
         "src/core/lib/profiling/stap_timers.c",
-        "src/core/lib/support/arena.c",
         "src/core/lib/support/alloc.c",
+        "src/core/lib/support/arena.c",
         "src/core/lib/support/atm.c",
         "src/core/lib/support/avl.c",
         "src/core/lib/support/backoff.c",
@@ -354,8 +354,8 @@
         "src/core/lib/support/wrap_memcpy.c",
     ],
     hdrs = [
-        "src/core/lib/support/arena.h",
         "src/core/lib/profiling/timers.h",
+        "src/core/lib/support/arena.h",
         "src/core/lib/support/backoff.h",
         "src/core/lib/support/block_annotate.h",
         "src/core/lib/support/env.h",
@@ -527,6 +527,7 @@
         "src/core/lib/surface/channel_ping.c",
         "src/core/lib/surface/channel_stack_type.c",
         "src/core/lib/surface/completion_queue.c",
+        "src/core/lib/surface/completion_queue_factory.c",
         "src/core/lib/surface/event_string.c",
         "src/core/lib/surface/lame_client.c",
         "src/core/lib/surface/metadata_array.c",
@@ -636,6 +637,7 @@
         "src/core/lib/surface/channel_init.h",
         "src/core/lib/surface/channel_stack_type.h",
         "src/core/lib/surface/completion_queue.h",
+        "src/core/lib/surface/completion_queue_factory.h",
         "src/core/lib/surface/event_string.h",
         "src/core/lib/surface/init.h",
         "src/core/lib/surface/lame_client.h",