Add more CHECKs to help investigate the Mojo bootstrap crash

mojo/edk/embedder/embedder.cc

Index: mojo/edk/embedder/embedder.cc
diff --git a/mojo/edk/embedder/embedder.cc b/mojo/edk/embedder/embedder.cc
index fa4e6ea62a25d873cf14486eb513354d8510680a..2fe0c8dc559e8b7b16866a21e086ffed37a4e746 100644
--- a/mojo/edk/embedder/embedder.cc
+++ b/mojo/edk/embedder/embedder.cc
@@ -107,17 +107,20 @@ void ShutdownIPCSupport() {
 
 ScopedMessagePipeHandle CreateMessagePipe(
     ScopedPlatformHandle platform_handle) {
-  DCHECK(internal::g_core);
+  CHECK(internal::g_process_delegate);
+  CHECK(internal::g_core);
   return internal::g_core->CreateMessagePipe(std::move(platform_handle));
 }
 
 ScopedMessagePipeHandle CreateParentMessagePipe(const std::string& token) {
-  DCHECK(internal::g_core);
+  CHECK(internal::g_process_delegate);
+  CHECK(internal::g_core);
   return internal::g_core->CreateParentMessagePipe(token);
 }
 
 ScopedMessagePipeHandle CreateChildMessagePipe(const std::string& token) {
-  DCHECK(internal::g_core);
+  CHECK(internal::g_process_delegate);
+  CHECK(internal::g_core);
   return internal::g_core->CreateChildMessagePipe(token);
 }