mojom: Add conformance tests for map<>.

mojo/public/interfaces/bindings/tests/data/validation/conformance_mthd10_one_null_key.data

Index: mojo/public/interfaces/bindings/tests/data/validation/conformance_mthd10_one_null_key.data
diff --git a/mojo/public/interfaces/bindings/tests/data/validation/conformance_mthd10_one_null_key.data b/mojo/public/interfaces/bindings/tests/data/validation/conformance_mthd10_one_null_key.data
new file mode 100644
index 0000000000000000000000000000000000000000..06b55fbf52e94e3d80f92560f108c14b4f989a5a
--- /dev/null
+++ b/mojo/public/interfaces/bindings/tests/data/validation/conformance_mthd10_one_null_key.data
@@ -0,0 +1,38 @@
+[dist4]message_header  // num_bytes
+[u4]2                  // num_fields
+[u4]10                 // name
+[u4]0                  // flags
+[anchr]message_header
+
+[dist4]method10_params  // num_bytes
+[u4]1                   // num_fields
+[dist8]map_data_ptr     // param0
+[anchr]method10_params
+
+[anchr]map_data_ptr
+[dist4]map_data_struct_header  // num_bytes
+[u4]2                          // num_elements
+[dist8]key_array_ptr
+[dist8]value_array_ptr
+[anchr]map_data_struct_header
+
+[anchr]key_array_ptr
+[dist4]key_array_member   // num_bytes
+[u4]2                     // num_elements
+[dist8]key_string_1
+[u8]0                     // one null key
+[anchr]key_array_member
+
+[anchr]key_string_1
+[dist4]key_string_1_member  // num_bytes
+[u4]5                       // num_elements
+0 1 2 3 4
+[anchr]key_string_1_member
+
+[u4]0 [u4]0 [u1]0 [u1]0 [u1]0  // manual padding for array alignment
+
+[anchr]value_array_ptr
+[dist4]value_array_member   // num_bytes
+[u4]2                       // num_elements
+1 2
+[anchr]value_array_member