[gin] Add a v8::Platform implementation to allow for v8 posting tasks

gin/gin.gyp

Index: gin/gin.gyp
diff --git a/gin/gin.gyp b/gin/gin.gyp
index a7b359f16e2b7db379c56c96b9f1439e29000eb7..f7f25a9119ea4b7cf13895104f5608f7b73361f5 100644
--- a/gin/gin.gyp
+++ b/gin/gin.gyp
@@ -12,7 +12,9 @@
       'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
+        '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../v8/tools/gyp/v8.gyp:v8',
+
       ],
       'export_dependent_settings': [
         '../base/base.gyp:base',
@@ -58,6 +60,7 @@
         'public/context_holder.h',
         'public/gin_embedders.h',
         'public/isolate_holder.h',
+        'public/v8_platform.h',
         'public/wrapper_info.h',
         'runner.cc',
         'runner.h',
@@ -65,6 +68,7 @@
         'shell_runner.h',
         'try_catch.cc',
         'try_catch.h',
+        'v8_platform.cc',
         'wrappable.cc',
         'wrappable.h',
         'wrapper_info.cc',