Extract mojo_base.gyp from mojo.gyp

mojo/mojo_apps.gypi

 {
   'targets': [
     {
       'target_name': 'mojo_js_lib',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
         '../gin/gin.gyp:gin',
         '../ui/gl/gl.gyp:gl',
         '../v8/tools/gyp/v8.gyp:v8',
-        'mojo_common_lib',
-        'mojo_environment_chromium',
+        'mojo_base.gyp:mojo_common_lib',
+        'mojo_base.gyp:mojo_environment_chromium',
+        'mojo_base.gyp:mojo_js_bindings_lib',
         'mojo_gles2',
         'mojo_gles2_bindings',
-        'mojo_js_bindings_lib',
         'mojo_native_viewport_bindings',
       ],
       'export_dependent_settings': [
         '../base/base.gyp:base',
         '../gin/gin.gyp:gin',
-        'mojo_common_lib',
+        'mojo_base.gyp:mojo_common_lib',
         'mojo_gles2',
         'mojo_gles2_bindings',
         'mojo_native_viewport_bindings',
       ],
       'sources': [
         'apps/js/mojo_runner_delegate.cc',
         'apps/js/mojo_runner_delegate.h',
         'apps/js/bindings/threading.cc',
         'apps/js/bindings/threading.h',
         'apps/js/bindings/gl/context.cc',
         'apps/js/bindings/gl/context.h',
         'apps/js/bindings/gl/module.cc',
         'apps/js/bindings/gl/module.h',
         'apps/js/bindings/monotonic_clock.cc',
         'apps/js/bindings/monotonic_clock.h',
       ],
     },
     {
       'target_name': 'mojo_apps_js_bindings',
       'type': 'static_library',
       'sources': [
         'apps/js/test/js_to_cpp.mojom',
       ],
       'includes': [ 'public/tools/bindings/mojom_bindings_generator.gypi' ],
       'export_dependent_settings': [
-        'mojo_cpp_bindings',
+        'mojo_base.gyp:mojo_cpp_bindings',
       ],
       'dependencies': [
-        'mojo_cpp_bindings',
+        'mojo_base.gyp:mojo_cpp_bindings',
       ],
     },
     {
       'target_name': 'mojo_apps_js_unittests',
       'type': 'executable',
       'dependencies': [
         '../gin/gin.gyp:gin_test',
+        'mojo_base.gyp:mojo_common_lib',
+        'mojo_base.gyp:mojo_common_test_support',
+        'mojo_base.gyp:mojo_public_test_interfaces',
+        'mojo_base.gyp:mojo_run_all_unittests',
         'mojo_apps_js_bindings',
-        'mojo_common_lib',
-        'mojo_common_test_support',
         'mojo_js_lib',
-        'mojo_run_all_unittests',
-        'mojo_public_test_interfaces',
       ],
       'sources': [
         'apps/js/test/js_to_cpp_unittest.cc',
         'apps/js/test/run_apps_js_tests.cc',
       ],
     },
     {
       'target_name': 'mojo_js',
       'type': 'loadable_module',
       'dependencies': [
@@ skipping 19 matching lines @@
             'mojo_apps_js_unittests.isolate',
           ],
           'sources': [
             'mojo_apps_js_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }