Rename GrpcRpcManager -> ThreadManager
diff --git a/BUILD b/BUILD
index 8178c9f..0167cb5 100644
--- a/BUILD
+++ b/BUILD
@@ -1270,9 +1270,9 @@
     "src/cpp/server/secure_server_credentials.h",
     "src/cpp/client/create_channel_internal.h",
     "src/cpp/common/channel_filter.h",
-    "src/cpp/rpcmanager/grpc_rpc_manager.h",
     "src/cpp/server/dynamic_thread_pool.h",
     "src/cpp/server/thread_pool_interface.h",
+    "src/cpp/thread_manager/thread_manager.h",
     "src/cpp/client/insecure_credentials.cc",
     "src/cpp/client/secure_credentials.cc",
     "src/cpp/common/auth_property_iterator.cc",
@@ -1293,7 +1293,6 @@
     "src/cpp/common/completion_queue_cc.cc",
     "src/cpp/common/core_codegen.cc",
     "src/cpp/common/rpc_method.cc",
-    "src/cpp/rpcmanager/grpc_rpc_manager.cc",
     "src/cpp/server/async_generic_service.cc",
     "src/cpp/server/create_default_thread_pool.cc",
     "src/cpp/server/dynamic_thread_pool.cc",
@@ -1302,6 +1301,7 @@
     "src/cpp/server/server_context.cc",
     "src/cpp/server/server_credentials.cc",
     "src/cpp/server/server_posix.cc",
+    "src/cpp/thread_manager/thread_manager.cc",
     "src/cpp/util/byte_buffer_cc.cc",
     "src/cpp/util/slice_cc.cc",
     "src/cpp/util/status.cc",
@@ -1499,9 +1499,9 @@
   srcs = [
     "src/cpp/client/create_channel_internal.h",
     "src/cpp/common/channel_filter.h",
-    "src/cpp/rpcmanager/grpc_rpc_manager.h",
     "src/cpp/server/dynamic_thread_pool.h",
     "src/cpp/server/thread_pool_interface.h",
+    "src/cpp/thread_manager/thread_manager.h",
     "src/cpp/client/insecure_credentials.cc",
     "src/cpp/common/insecure_create_auth_context.cc",
     "src/cpp/server/insecure_server_credentials.cc",
@@ -1517,7 +1517,6 @@
     "src/cpp/common/completion_queue_cc.cc",
     "src/cpp/common/core_codegen.cc",
     "src/cpp/common/rpc_method.cc",
-    "src/cpp/rpcmanager/grpc_rpc_manager.cc",
     "src/cpp/server/async_generic_service.cc",
     "src/cpp/server/create_default_thread_pool.cc",
     "src/cpp/server/dynamic_thread_pool.cc",
@@ -1526,6 +1525,7 @@
     "src/cpp/server/server_context.cc",
     "src/cpp/server/server_credentials.cc",
     "src/cpp/server/server_posix.cc",
+    "src/cpp/thread_manager/thread_manager.cc",
     "src/cpp/util/byte_buffer_cc.cc",
     "src/cpp/util/slice_cc.cc",
     "src/cpp/util/status.cc",