Add rights for mapping buffer. Update (shared) buffer APIs.

mojo/edk/system/core_test_base.cc

Index: mojo/edk/system/core_test_base.cc
diff --git a/mojo/edk/system/core_test_base.cc b/mojo/edk/system/core_test_base.cc
index ed98702b797f42019017a2e64168c53686eef951..1f982ecd796f1bab4bfb1cf150d30198ddebe90b 100644
--- a/mojo/edk/system/core_test_base.cc
+++ b/mojo/edk/system/core_test_base.cc
@@ -230,7 +230,9 @@ MojoHandle CoreTestBase::CreateMockHandle(CoreTestBase::MockHandleInfo* info) {
       std::move(dispatcher),
       MOJO_HANDLE_RIGHT_DUPLICATE | MOJO_HANDLE_RIGHT_TRANSFER |
           MOJO_HANDLE_RIGHT_READ | MOJO_HANDLE_RIGHT_WRITE |
-          MOJO_HANDLE_RIGHT_GET_OPTIONS | MOJO_HANDLE_RIGHT_SET_OPTIONS));
+          MOJO_HANDLE_RIGHT_GET_OPTIONS | MOJO_HANDLE_RIGHT_SET_OPTIONS |
+          MOJO_HANDLE_RIGHT_MAP_READABLE | MOJO_HANDLE_RIGHT_MAP_WRITABLE |
+          MOJO_HANDLE_RIGHT_MAP_EXECUTABLE));
   CHECK_NE(rv, MOJO_HANDLE_INVALID);
   return rv;
 }