Introducing iomgr.

Move eventmanager and platform dependent endpoint functionality into a single
library called 'iomgr'.

This is primarily to prepare for a Windows port - where posix socket semantics
lead to poor quality code.

Mostly this is a code movement CL, with some small changes to help prepare the
way for porting:

- em style fd objects can only be held internally in iomgr, and own their memory
- added grpc_iomgr_create_endpoint_pair() to accomodate the common pattern of
creating a tcp endpoint from the output of socketpair - this will help keep
our tests portable
- separated em alarm interface into a separate file, as this part of event
manager is needed higher up the stack
- made the eventmanager bits a true singleton, simplifying API's across the
stack as there's no longer a reason to carry a pointer there.

Initial design document is here:
https://docs.google.com/document/d/1VmafcHvvrP5kwtQkz84R5yXF7u7fW-9Pn0bkSUQHDt8/edit?disco=AAAAARNByxg
	Change on 2014/12/09 by ctiller <ctiller@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=81716456

2 files changed, 10 insertions, 11 deletions

diff --git a/src/core/security/credentials.c b/src/core/security/credentials.c
index 7ff48f9123..bfc2e3361a 100644
--- a/src/core/security/credentials.c
+++ b/src/core/security/credentials.c
@@ -34,7 +34,7 @@
 #include "src/core/security/credentials.h"
 
 #include "src/core/httpcli/httpcli.h"
-#include "src/core/surface/surface_em.h"
+#include "src/core/iomgr/iomgr.h"
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/string.h>
@@ -379,7 +379,7 @@ static void compute_engine_get_request_metadata(grpc_credentials *creds,
     request.hdr_count = 1;
     request.hdrs = &header;
     grpc_httpcli_get(
-        &request, gpr_time_add(gpr_now(), refresh_threshold), grpc_surface_em(),
+        &request, gpr_time_add(gpr_now(), refresh_threshold),
         on_compute_engine_token_response,
         grpc_credentials_metadata_request_create(creds, cb, user_data));
   } else {
@@ -433,7 +433,8 @@ static int fake_oauth2_has_request_metadata_only(
   return 1;
 }
 
-void on_simulated_token_fetch_done(void *user_data, grpc_em_cb_status status) {
+void on_simulated_token_fetch_done(void *user_data,
+                                   grpc_iomgr_cb_status status) {
   grpc_credentials_metadata_request *r =
       (grpc_credentials_metadata_request *)user_data;
   grpc_fake_oauth2_credentials *c = (grpc_fake_oauth2_credentials *)r->creds;
@@ -448,10 +449,9 @@ static void fake_oauth2_get_request_metadata(grpc_credentials *creds,
   grpc_fake_oauth2_credentials *c = (grpc_fake_oauth2_credentials *)creds;
 
   if (c->is_async) {
-    GPR_ASSERT(grpc_em_add_callback(grpc_surface_em(),
-                                    on_simulated_token_fetch_done,
-                                    grpc_credentials_metadata_request_create(
-                                        creds, cb, user_data)) == GRPC_EM_OK);
+    grpc_iomgr_add_callback(
+        on_simulated_token_fetch_done,
+        grpc_credentials_metadata_request_create(creds, cb, user_data));
   } else {
     cb(user_data, &c->access_token_md, 1, GRPC_CREDENTIALS_OK);
   }
diff --git a/src/core/security/server_secure_chttp2.c b/src/core/security/server_secure_chttp2.c
index 335d502217..28b56dd4c9 100644
--- a/src/core/security/server_secure_chttp2.c
+++ b/src/core/security/server_secure_chttp2.c
@@ -35,12 +35,11 @@
 
 #include "src/core/channel/http_filter.h"
 #include "src/core/channel/http_server_filter.h"
-#include "src/core/endpoint/resolve_address.h"
-#include "src/core/endpoint/tcp_server.h"
+#include "src/core/iomgr/resolve_address.h"
+#include "src/core/iomgr/tcp_server.h"
 #include "src/core/security/security_context.h"
 #include "src/core/security/secure_transport_setup.h"
 #include "src/core/surface/server.h"
-#include "src/core/surface/surface_em.h"
 #include "src/core/transport/chttp2_transport.h"
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
@@ -101,7 +100,7 @@ int grpc_server_add_secure_http2_port(grpc_server *server, const char *addr) {
     goto error;
   }
 
-  tcp = grpc_tcp_server_create(grpc_surface_em());
+  tcp = grpc_tcp_server_create();
   if (!tcp) {
     goto error;
   }