Add IPC stubs between browser and ServiceWorker's worker context in the child process

content/common/service_worker_types.cc

Index: content/common/service_worker_types.cc
diff --git a/content/browser/power_save_blocker_android.h b/content/common/service_worker_types.cc
similarity index 56%
copy from content/browser/power_save_blocker_android.h
copy to content/common/service_worker_types.cc
index 1df7d697b53df6b968363eed4551f2b3e10faef3..116930d239f8a1201a1ef9df4ecee0281dc09524 100644
--- a/content/browser/power_save_blocker_android.h
+++ b/content/common/service_worker_types.cc
@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include <jni.h>
+#include "content/common/service_worker_types.h"
 
 namespace content {
 
-bool RegisterPowerSaveBlocker(JNIEnv* env);
+ServiceWorkerFetchRequest::ServiceWorkerFetchRequest() {}
+ServiceWorkerFetchRequest::~ServiceWorkerFetchRequest() {}
 
 }  // namespace content