Fuchsia: Build standalone VM. Make it run "Hello, World!".

runtime/bin/io_impl_sources.gypi

Index: runtime/bin/io_impl_sources.gypi
diff --git a/runtime/bin/io_impl_sources.gypi b/runtime/bin/io_impl_sources.gypi
index 9ca2ed2ced1dd64a2cc32ce8313afec0e6b36890..1e5a1a469efda5e2ef37dd434c73186cc9f320a2 100644
--- a/runtime/bin/io_impl_sources.gypi
+++ b/runtime/bin/io_impl_sources.gypi
@@ -10,6 +10,8 @@
     'eventhandler.h',
     'eventhandler_android.cc',
     'eventhandler_android.h',
+    'eventhandler_fuchsia.cc',
+    'eventhandler_fuchsia.h',
     'eventhandler_linux.cc',
     'eventhandler_linux.h',
     'eventhandler_macos.cc',
@@ -20,6 +22,7 @@
     'file_system_watcher.cc',
     'file_system_watcher.h',
     'file_system_watcher_android.cc',
+    'file_system_watcher_fuchsia.cc',
     'file_system_watcher_linux.cc',
     'file_system_watcher_macos.cc',
     'file_system_watcher_unsupported.cc',
@@ -35,6 +38,7 @@
     'platform.cc',
     'platform.h',
     'platform_android.cc',
+    'platform_fuchsia.cc',
     'platform_linux.cc',
     'platform_macos.cc',
     'platform_unsupported.cc',
@@ -42,6 +46,7 @@
     'process.cc',
     'process.h',
     'process_android.cc',
+    'process_fuchsia.cc',
     'process_linux.cc',
     'process_macos.cc',
     'process_unsupported.cc',
@@ -60,6 +65,8 @@
     'socket.h',
     'socket_android.cc',
     'socket_android.h',
+    'socket_fuchsia.cc',
+    'socket_fuchsia.h',
     'socket_linux.cc',
     'socket_linux.h',
     'socket_macos.cc',
@@ -70,6 +77,7 @@
     'stdio.cc',
     'stdio.h',
     'stdio_android.cc',
+    'stdio_fuchsia.cc',
     'stdio_linux.cc',
     'stdio_macos.cc',
     'stdio_unsupported.cc',