Add a libuv endpoint to the C core, for use in the Node library
diff --git a/BUILD b/BUILD
index cf81163..57f0e0d 100644
--- a/BUILD
+++ b/BUILD
@@ -194,6 +194,7 @@
     "src/core/lib/iomgr/pollset.h",
     "src/core/lib/iomgr/pollset_set.h",
     "src/core/lib/iomgr/pollset_set_windows.h",
+    "src/core/lib/iomgr/pollset_uv.h",
     "src/core/lib/iomgr/pollset_windows.h",
     "src/core/lib/iomgr/port.h",
     "src/core/lib/iomgr/resolve_address.h",
@@ -207,16 +208,20 @@
     "src/core/lib/iomgr/tcp_client.h",
     "src/core/lib/iomgr/tcp_posix.h",
     "src/core/lib/iomgr/tcp_server.h",
+    "src/core/lib/iomgr/tcp_uv.h",
     "src/core/lib/iomgr/tcp_windows.h",
     "src/core/lib/iomgr/time_averaged_stats.h",
     "src/core/lib/iomgr/timer.h",
+    "src/core/lib/iomgr/timer_generic.h",
     "src/core/lib/iomgr/timer_heap.h",
+    "src/core/lib/iomgr/timer_uv.h",
     "src/core/lib/iomgr/udp_server.h",
     "src/core/lib/iomgr/unix_sockets_posix.h",
     "src/core/lib/iomgr/wakeup_fd_pipe.h",
     "src/core/lib/iomgr/wakeup_fd_posix.h",
     "src/core/lib/iomgr/workqueue.h",
     "src/core/lib/iomgr/workqueue_posix.h",
+    "src/core/lib/iomgr/workqueue_uv.h",
     "src/core/lib/iomgr/workqueue_windows.h",
     "src/core/lib/json/json.h",
     "src/core/lib/json/json_common.h",
@@ -345,29 +350,38 @@
     "src/core/lib/iomgr/iocp_windows.c",
     "src/core/lib/iomgr/iomgr.c",
     "src/core/lib/iomgr/iomgr_posix.c",
+    "src/core/lib/iomgr/iomgr_uv.c",
     "src/core/lib/iomgr/iomgr_windows.c",
     "src/core/lib/iomgr/load_file.c",
     "src/core/lib/iomgr/network_status_tracker.c",
     "src/core/lib/iomgr/polling_entity.c",
+    "src/core/lib/iomgr/pollset_set_uv.c",
     "src/core/lib/iomgr/pollset_set_windows.c",
+    "src/core/lib/iomgr/pollset_uv.c",
     "src/core/lib/iomgr/pollset_windows.c",
     "src/core/lib/iomgr/resolve_address_posix.c",
+    "src/core/lib/iomgr/resolve_address_uv.c",
     "src/core/lib/iomgr/resolve_address_windows.c",
     "src/core/lib/iomgr/sockaddr_utils.c",
     "src/core/lib/iomgr/socket_utils_common_posix.c",
     "src/core/lib/iomgr/socket_utils_linux.c",
     "src/core/lib/iomgr/socket_utils_posix.c",
+    "src/core/lib/iomgr/socket_utils_uv.c",
     "src/core/lib/iomgr/socket_utils_windows.c",
     "src/core/lib/iomgr/socket_windows.c",
     "src/core/lib/iomgr/tcp_client_posix.c",
+    "src/core/lib/iomgr/tcp_client_uv.c",
     "src/core/lib/iomgr/tcp_client_windows.c",
     "src/core/lib/iomgr/tcp_posix.c",
     "src/core/lib/iomgr/tcp_server_posix.c",
+    "src/core/lib/iomgr/tcp_server_uv.c",
     "src/core/lib/iomgr/tcp_server_windows.c",
+    "src/core/lib/iomgr/tcp_uv.c",
     "src/core/lib/iomgr/tcp_windows.c",
     "src/core/lib/iomgr/time_averaged_stats.c",
-    "src/core/lib/iomgr/timer.c",
+    "src/core/lib/iomgr/timer_generic.c",
     "src/core/lib/iomgr/timer_heap.c",
+    "src/core/lib/iomgr/timer_uv.c",
     "src/core/lib/iomgr/udp_server.c",
     "src/core/lib/iomgr/unix_sockets_posix.c",
     "src/core/lib/iomgr/unix_sockets_posix_noop.c",
@@ -376,6 +390,7 @@
     "src/core/lib/iomgr/wakeup_fd_pipe.c",
     "src/core/lib/iomgr/wakeup_fd_posix.c",
     "src/core/lib/iomgr/workqueue_posix.c",
+    "src/core/lib/iomgr/workqueue_uv.c",
     "src/core/lib/iomgr/workqueue_windows.c",
     "src/core/lib/json/json.c",
     "src/core/lib/json/json_reader.c",
@@ -591,6 +606,7 @@
     "src/core/lib/iomgr/pollset.h",
     "src/core/lib/iomgr/pollset_set.h",
     "src/core/lib/iomgr/pollset_set_windows.h",
+    "src/core/lib/iomgr/pollset_uv.h",
     "src/core/lib/iomgr/pollset_windows.h",
     "src/core/lib/iomgr/port.h",
     "src/core/lib/iomgr/resolve_address.h",
@@ -604,16 +620,20 @@
     "src/core/lib/iomgr/tcp_client.h",
     "src/core/lib/iomgr/tcp_posix.h",
     "src/core/lib/iomgr/tcp_server.h",
+    "src/core/lib/iomgr/tcp_uv.h",
     "src/core/lib/iomgr/tcp_windows.h",
     "src/core/lib/iomgr/time_averaged_stats.h",
     "src/core/lib/iomgr/timer.h",
+    "src/core/lib/iomgr/timer_generic.h",
     "src/core/lib/iomgr/timer_heap.h",
+    "src/core/lib/iomgr/timer_uv.h",
     "src/core/lib/iomgr/udp_server.h",
     "src/core/lib/iomgr/unix_sockets_posix.h",
     "src/core/lib/iomgr/wakeup_fd_pipe.h",
     "src/core/lib/iomgr/wakeup_fd_posix.h",
     "src/core/lib/iomgr/workqueue.h",
     "src/core/lib/iomgr/workqueue_posix.h",
+    "src/core/lib/iomgr/workqueue_uv.h",
     "src/core/lib/iomgr/workqueue_windows.h",
     "src/core/lib/json/json.h",
     "src/core/lib/json/json_common.h",
@@ -729,29 +749,38 @@
     "src/core/lib/iomgr/iocp_windows.c",
     "src/core/lib/iomgr/iomgr.c",
     "src/core/lib/iomgr/iomgr_posix.c",
+    "src/core/lib/iomgr/iomgr_uv.c",
     "src/core/lib/iomgr/iomgr_windows.c",
     "src/core/lib/iomgr/load_file.c",
     "src/core/lib/iomgr/network_status_tracker.c",
     "src/core/lib/iomgr/polling_entity.c",
+    "src/core/lib/iomgr/pollset_set_uv.c",
     "src/core/lib/iomgr/pollset_set_windows.c",
+    "src/core/lib/iomgr/pollset_uv.c",
     "src/core/lib/iomgr/pollset_windows.c",
     "src/core/lib/iomgr/resolve_address_posix.c",
+    "src/core/lib/iomgr/resolve_address_uv.c",
     "src/core/lib/iomgr/resolve_address_windows.c",
     "src/core/lib/iomgr/sockaddr_utils.c",
     "src/core/lib/iomgr/socket_utils_common_posix.c",
     "src/core/lib/iomgr/socket_utils_linux.c",
     "src/core/lib/iomgr/socket_utils_posix.c",
+    "src/core/lib/iomgr/socket_utils_uv.c",
     "src/core/lib/iomgr/socket_utils_windows.c",
     "src/core/lib/iomgr/socket_windows.c",
     "src/core/lib/iomgr/tcp_client_posix.c",
+    "src/core/lib/iomgr/tcp_client_uv.c",
     "src/core/lib/iomgr/tcp_client_windows.c",
     "src/core/lib/iomgr/tcp_posix.c",
     "src/core/lib/iomgr/tcp_server_posix.c",
+    "src/core/lib/iomgr/tcp_server_uv.c",
     "src/core/lib/iomgr/tcp_server_windows.c",
+    "src/core/lib/iomgr/tcp_uv.c",
     "src/core/lib/iomgr/tcp_windows.c",
     "src/core/lib/iomgr/time_averaged_stats.c",
-    "src/core/lib/iomgr/timer.c",
+    "src/core/lib/iomgr/timer_generic.c",
     "src/core/lib/iomgr/timer_heap.c",
+    "src/core/lib/iomgr/timer_uv.c",
     "src/core/lib/iomgr/udp_server.c",
     "src/core/lib/iomgr/unix_sockets_posix.c",
     "src/core/lib/iomgr/unix_sockets_posix_noop.c",
@@ -760,6 +789,7 @@
     "src/core/lib/iomgr/wakeup_fd_pipe.c",
     "src/core/lib/iomgr/wakeup_fd_posix.c",
     "src/core/lib/iomgr/workqueue_posix.c",
+    "src/core/lib/iomgr/workqueue_uv.c",
     "src/core/lib/iomgr/workqueue_windows.c",
     "src/core/lib/json/json.c",
     "src/core/lib/json/json_reader.c",
@@ -947,6 +977,7 @@
     "src/core/lib/iomgr/pollset.h",
     "src/core/lib/iomgr/pollset_set.h",
     "src/core/lib/iomgr/pollset_set_windows.h",
+    "src/core/lib/iomgr/pollset_uv.h",
     "src/core/lib/iomgr/pollset_windows.h",
     "src/core/lib/iomgr/port.h",
     "src/core/lib/iomgr/resolve_address.h",
@@ -960,16 +991,20 @@
     "src/core/lib/iomgr/tcp_client.h",
     "src/core/lib/iomgr/tcp_posix.h",
     "src/core/lib/iomgr/tcp_server.h",
+    "src/core/lib/iomgr/tcp_uv.h",
     "src/core/lib/iomgr/tcp_windows.h",
     "src/core/lib/iomgr/time_averaged_stats.h",
     "src/core/lib/iomgr/timer.h",
+    "src/core/lib/iomgr/timer_generic.h",
     "src/core/lib/iomgr/timer_heap.h",
+    "src/core/lib/iomgr/timer_uv.h",
     "src/core/lib/iomgr/udp_server.h",
     "src/core/lib/iomgr/unix_sockets_posix.h",
     "src/core/lib/iomgr/wakeup_fd_pipe.h",
     "src/core/lib/iomgr/wakeup_fd_posix.h",
     "src/core/lib/iomgr/workqueue.h",
     "src/core/lib/iomgr/workqueue_posix.h",
+    "src/core/lib/iomgr/workqueue_uv.h",
     "src/core/lib/iomgr/workqueue_windows.h",
     "src/core/lib/json/json.h",
     "src/core/lib/json/json_common.h",
@@ -1075,29 +1110,38 @@
     "src/core/lib/iomgr/iocp_windows.c",
     "src/core/lib/iomgr/iomgr.c",
     "src/core/lib/iomgr/iomgr_posix.c",
+    "src/core/lib/iomgr/iomgr_uv.c",
     "src/core/lib/iomgr/iomgr_windows.c",
     "src/core/lib/iomgr/load_file.c",
     "src/core/lib/iomgr/network_status_tracker.c",
     "src/core/lib/iomgr/polling_entity.c",
+    "src/core/lib/iomgr/pollset_set_uv.c",
     "src/core/lib/iomgr/pollset_set_windows.c",
+    "src/core/lib/iomgr/pollset_uv.c",
     "src/core/lib/iomgr/pollset_windows.c",
     "src/core/lib/iomgr/resolve_address_posix.c",
+    "src/core/lib/iomgr/resolve_address_uv.c",
     "src/core/lib/iomgr/resolve_address_windows.c",
     "src/core/lib/iomgr/sockaddr_utils.c",
     "src/core/lib/iomgr/socket_utils_common_posix.c",
     "src/core/lib/iomgr/socket_utils_linux.c",
     "src/core/lib/iomgr/socket_utils_posix.c",
+    "src/core/lib/iomgr/socket_utils_uv.c",
     "src/core/lib/iomgr/socket_utils_windows.c",
     "src/core/lib/iomgr/socket_windows.c",
     "src/core/lib/iomgr/tcp_client_posix.c",
+    "src/core/lib/iomgr/tcp_client_uv.c",
     "src/core/lib/iomgr/tcp_client_windows.c",
     "src/core/lib/iomgr/tcp_posix.c",
     "src/core/lib/iomgr/tcp_server_posix.c",
+    "src/core/lib/iomgr/tcp_server_uv.c",
     "src/core/lib/iomgr/tcp_server_windows.c",
+    "src/core/lib/iomgr/tcp_uv.c",
     "src/core/lib/iomgr/tcp_windows.c",
     "src/core/lib/iomgr/time_averaged_stats.c",
-    "src/core/lib/iomgr/timer.c",
+    "src/core/lib/iomgr/timer_generic.c",
     "src/core/lib/iomgr/timer_heap.c",
+    "src/core/lib/iomgr/timer_uv.c",
     "src/core/lib/iomgr/udp_server.c",
     "src/core/lib/iomgr/unix_sockets_posix.c",
     "src/core/lib/iomgr/unix_sockets_posix_noop.c",
@@ -1106,6 +1150,7 @@
     "src/core/lib/iomgr/wakeup_fd_pipe.c",
     "src/core/lib/iomgr/wakeup_fd_posix.c",
     "src/core/lib/iomgr/workqueue_posix.c",
+    "src/core/lib/iomgr/workqueue_uv.c",
     "src/core/lib/iomgr/workqueue_windows.c",
     "src/core/lib/json/json.c",
     "src/core/lib/json/json_reader.c",
@@ -1843,29 +1888,38 @@
     "src/core/lib/iomgr/iocp_windows.c",
     "src/core/lib/iomgr/iomgr.c",
     "src/core/lib/iomgr/iomgr_posix.c",
+    "src/core/lib/iomgr/iomgr_uv.c",
     "src/core/lib/iomgr/iomgr_windows.c",
     "src/core/lib/iomgr/load_file.c",
     "src/core/lib/iomgr/network_status_tracker.c",
     "src/core/lib/iomgr/polling_entity.c",
+    "src/core/lib/iomgr/pollset_set_uv.c",
     "src/core/lib/iomgr/pollset_set_windows.c",
+    "src/core/lib/iomgr/pollset_uv.c",
     "src/core/lib/iomgr/pollset_windows.c",
     "src/core/lib/iomgr/resolve_address_posix.c",
+    "src/core/lib/iomgr/resolve_address_uv.c",
     "src/core/lib/iomgr/resolve_address_windows.c",
     "src/core/lib/iomgr/sockaddr_utils.c",
     "src/core/lib/iomgr/socket_utils_common_posix.c",
     "src/core/lib/iomgr/socket_utils_linux.c",
     "src/core/lib/iomgr/socket_utils_posix.c",
+    "src/core/lib/iomgr/socket_utils_uv.c",
     "src/core/lib/iomgr/socket_utils_windows.c",
     "src/core/lib/iomgr/socket_windows.c",
     "src/core/lib/iomgr/tcp_client_posix.c",
+    "src/core/lib/iomgr/tcp_client_uv.c",
     "src/core/lib/iomgr/tcp_client_windows.c",
     "src/core/lib/iomgr/tcp_posix.c",
     "src/core/lib/iomgr/tcp_server_posix.c",
+    "src/core/lib/iomgr/tcp_server_uv.c",
     "src/core/lib/iomgr/tcp_server_windows.c",
+    "src/core/lib/iomgr/tcp_uv.c",
     "src/core/lib/iomgr/tcp_windows.c",
     "src/core/lib/iomgr/time_averaged_stats.c",
-    "src/core/lib/iomgr/timer.c",
+    "src/core/lib/iomgr/timer_generic.c",
     "src/core/lib/iomgr/timer_heap.c",
+    "src/core/lib/iomgr/timer_uv.c",
     "src/core/lib/iomgr/udp_server.c",
     "src/core/lib/iomgr/unix_sockets_posix.c",
     "src/core/lib/iomgr/unix_sockets_posix_noop.c",
@@ -1874,6 +1928,7 @@
     "src/core/lib/iomgr/wakeup_fd_pipe.c",
     "src/core/lib/iomgr/wakeup_fd_posix.c",
     "src/core/lib/iomgr/workqueue_posix.c",
+    "src/core/lib/iomgr/workqueue_uv.c",
     "src/core/lib/iomgr/workqueue_windows.c",
     "src/core/lib/json/json.c",
     "src/core/lib/json/json_reader.c",
@@ -2068,6 +2123,7 @@
     "src/core/lib/iomgr/pollset.h",
     "src/core/lib/iomgr/pollset_set.h",
     "src/core/lib/iomgr/pollset_set_windows.h",
+    "src/core/lib/iomgr/pollset_uv.h",
     "src/core/lib/iomgr/pollset_windows.h",
     "src/core/lib/iomgr/port.h",
     "src/core/lib/iomgr/resolve_address.h",
@@ -2081,16 +2137,20 @@
     "src/core/lib/iomgr/tcp_client.h",
     "src/core/lib/iomgr/tcp_posix.h",
     "src/core/lib/iomgr/tcp_server.h",
+    "src/core/lib/iomgr/tcp_uv.h",
     "src/core/lib/iomgr/tcp_windows.h",
     "src/core/lib/iomgr/time_averaged_stats.h",
     "src/core/lib/iomgr/timer.h",
+    "src/core/lib/iomgr/timer_generic.h",
     "src/core/lib/iomgr/timer_heap.h",
+    "src/core/lib/iomgr/timer_uv.h",
     "src/core/lib/iomgr/udp_server.h",
     "src/core/lib/iomgr/unix_sockets_posix.h",
     "src/core/lib/iomgr/wakeup_fd_pipe.h",
     "src/core/lib/iomgr/wakeup_fd_posix.h",
     "src/core/lib/iomgr/workqueue.h",
     "src/core/lib/iomgr/workqueue_posix.h",
+    "src/core/lib/iomgr/workqueue_uv.h",
     "src/core/lib/iomgr/workqueue_windows.h",
     "src/core/lib/json/json.h",
     "src/core/lib/json/json_common.h",