Add more CHECKs to help investigate the Mojo bootstrap crash

mojo/edk/embedder/embedder.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/embedder/embedder.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 89 matching lines @@
 void ShutdownIPCSupport() {
   CHECK(internal::g_process_delegate);
   CHECK(internal::g_core);
   internal::g_core->RequestShutdown(
       base::Bind(&ProcessDelegate::OnShutdownComplete,
                  base::Unretained(internal::g_process_delegate)));
 }
 
 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);
 }
 
 std::string GenerateRandomToken() {
   char random_bytes[16];
   crypto::RandBytes(random_bytes, 16);
   return base::HexEncode(random_bytes, 16);
 }
 
 }  // namespace edk
 }  // namespace mojo