Introduce ChannelMojo

mojo/embedder/embedder.cc

Index: mojo/embedder/embedder.cc
diff --git a/mojo/embedder/embedder.cc b/mojo/embedder/embedder.cc
index d4fd3814392deb5c06a87603c77ac84495302602..eff333a121a0a8546c1c2af0f823ce3ad0406ce5 100644
--- a/mojo/embedder/embedder.cc
+++ b/mojo/embedder/embedder.cc
@@ -97,6 +97,11 @@ void Init() {
   system::entrypoints::SetCore(new system::Core());
 }
 
+void InitIfNeeded() {
+  if (!system::entrypoints::GetCore())
+    system::entrypoints::SetCore(new system::Core());
+}
+
 ScopedMessagePipeHandle CreateChannel(
     ScopedPlatformHandle platform_handle,
     scoped_refptr<base::TaskRunner> io_thread_task_runner,