Mojo: more idiomatic C++ bindings

mojo/mojo_public.gypi

Index: mojo/mojo_public.gypi
diff --git a/mojo/mojo_public.gypi b/mojo/mojo_public.gypi
index 4bee9a353f27bc1c06d52bea74694c5aad8dac2c..b5fefb8aa6dded1d9f909a2790a71b7849435b2e 100644
--- a/mojo/mojo_public.gypi
+++ b/mojo/mojo_public.gypi
@@ -134,6 +134,8 @@
         'public/cpp/bindings/tests/request_response_unittest.cc',
         'public/cpp/bindings/tests/router_unittest.cc',
         'public/cpp/bindings/tests/sample_service_unittest.cc',
+        'public/cpp/bindings/tests/string_unittest.cc',
+        'public/cpp/bindings/tests/struct_unittest.cc',
         'public/cpp/bindings/tests/type_conversion_unittest.cc',
         'public/cpp/bindings/tests/validation_unittest.cc',
       ],
@@ -228,16 +230,15 @@
         'public/cpp/bindings/message.h',
         'public/cpp/bindings/message_filter.h',
         'public/cpp/bindings/no_interface.h',
-        'public/cpp/bindings/passable.h',
+        'public/cpp/bindings/string.h',
         'public/cpp/bindings/sync_dispatcher.h',
         'public/cpp/bindings/type_converter.h',
-        'public/cpp/bindings/lib/array.cc',
         'public/cpp/bindings/lib/array_internal.h',
         'public/cpp/bindings/lib/array_internal.cc',
+        'public/cpp/bindings/lib/array_serialization.h',
         'public/cpp/bindings/lib/bindings_internal.h',
         'public/cpp/bindings/lib/bindings_serialization.cc',
         'public/cpp/bindings/lib/bindings_serialization.h',
-        'public/cpp/bindings/lib/buffer.cc',
         'public/cpp/bindings/lib/callback_internal.h',
         'public/cpp/bindings/lib/connector.cc',
         'public/cpp/bindings/lib/connector.h',
@@ -259,10 +260,10 @@
         'public/cpp/bindings/lib/no_interface.cc',
         'public/cpp/bindings/lib/router.cc',
         'public/cpp/bindings/lib/router.h',
-        'public/cpp/bindings/lib/scratch_buffer.cc',
-        'public/cpp/bindings/lib/scratch_buffer.h',
         'public/cpp/bindings/lib/shared_data.h',
         'public/cpp/bindings/lib/shared_ptr.h',
+        'public/cpp/bindings/lib/string_serialization.h',
+        'public/cpp/bindings/lib/string_serialization.cc',
         'public/cpp/bindings/lib/sync_dispatcher.cc',
       ],
     },
@@ -304,12 +305,9 @@
       'target_name': 'mojo_environment_standalone',
       'type': 'static_library',
       'sources': [
-        'public/cpp/environment/buffer_tls.h',
         'public/cpp/environment/default_async_waiter.h',
         'public/cpp/environment/environment.h',
         'public/cpp/environment/lib/default_async_waiter.cc',
-        'public/cpp/environment/lib/buffer_tls.cc',
-        'public/cpp/environment/lib/buffer_tls_setup.h',
         'public/cpp/environment/lib/environment.cc',
       ],
       'include_dirs': [