Add GYP targets for mojo shell and some basic mojo services

third_party/mojo/mojom_bindings_generator_explicit.gypi

Index: third_party/mojo/mojom_bindings_generator_explicit.gypi
diff --git a/third_party/mojo/mojom_bindings_generator_explicit.gypi b/third_party/mojo/mojom_bindings_generator_explicit.gypi
index 6f129b52e915394152a1dd9e75fd8e60ebe5ad6b..0a61bbf0c239ae03c120538b683ce95660fd9edb 100644
--- a/third_party/mojo/mojom_bindings_generator_explicit.gypi
+++ b/third_party/mojo/mojom_bindings_generator_explicit.gypi
@@ -12,6 +12,7 @@
     'mojom_generated_outputs': [
       '<!@(python <(DEPTH)/third_party/mojo/src/mojo/public/tools/bindings/mojom_list_outputs.py --basedir <(mojom_base_output_dir) <@(mojom_files))',
     ],
+    'mojom_include_path%': '<(DEPTH)',
     'require_interface_bindings%': 1,
   },
   # Given mojom files as inputs, generate sources.  These sources will be
@@ -42,7 +43,8 @@
         'stamp_filename': '<(PRODUCT_DIR)/java_mojo/<(_target_name)/<(_target_name).stamp',
         'mojom_import_args%': [
          '-I<(DEPTH)',
-         '-I<(DEPTH)/third_party/mojo/src'
+         '-I<(DEPTH)/third_party/mojo/src',
+         '-I<(mojom_include_path)',
         ],
       },
       'inputs': [
@@ -77,6 +79,7 @@
   # preventing the code generator from being directly depended on by the "all"
   # target.
   'suppress_wildcard': '1',
+  'hard_dependency': '1',
   'direct_dependent_settings': {
     # A target directly depending on this action will compile the generated
     # sources.