Break up common_custom_types.mojom.

mojo/common/time.typemap

Index: mojo/common/time.typemap
diff --git a/mojo/common/time.typemap b/mojo/common/time.typemap
new file mode 100644
index 0000000000000000000000000000000000000000..99e9e3ae8d8dcbc3d57af23a4100c9f5efd4b194
--- /dev/null
+++ b/mojo/common/time.typemap
@@ -0,0 +1,20 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+mojom = "//mojo/common/time.mojom"
+public_headers = [ "//base/time/time.h" ]
+traits_headers = [
+  "//ipc/ipc_message_utils.h",
+  "//mojo/common/common_custom_types_struct_traits.h",
+]
+public_deps = [
+  "//ipc",
+  "//mojo/common:struct_traits",
+]
+
+type_mappings = [
+  "mojo.common.mojom.Time=base::Time[copyable_pass_by_value]",
+  "mojo.common.mojom.TimeDelta=base::TimeDelta[copyable_pass_by_value]",
+  "mojo.common.mojom.TimeTicks=base::TimeTicks[copyable_pass_by_value]",
+]