Add IDL and initial Blink API for Background Sync

Source/modules/background_sync/SyncError.cpp

Index: Source/modules/background_sync/SyncError.cpp
diff --git a/Source/modules/push_messaging/PushError.cpp b/Source/modules/background_sync/SyncError.cpp
similarity index 59%
copy from Source/modules/push_messaging/PushError.cpp
copy to Source/modules/background_sync/SyncError.cpp
index 1fd71d92ec679f82123fdba41437d5c93c8d58b0..b37847b1d922b7ef38d990ae8f22c4014ebe4399 100644
--- a/Source/modules/push_messaging/PushError.cpp
+++ b/Source/modules/background_sync/SyncError.cpp
@@ -1,33 +1,33 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright 2015 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 "config.h"
-#include "modules/push_messaging/PushError.h"
+#include "modules/background_sync/SyncError.h"
 
 #include "core/dom/ExceptionCode.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
-PassRefPtrWillBeRawPtr<DOMException> PushError::take(ScriptPromiseResolver*, WebType* webErrorRaw)
+PassRefPtrWillBeRawPtr<DOMException> SyncError::take(ScriptPromiseResolver*, WebType* webErrorRaw)
 {
     OwnPtr<WebType> webError = adoptPtr(webErrorRaw);
     switch (webError->errorType) {
-    case WebPushError::ErrorTypeAbort:
+    case WebSyncError::ErrorTypeAbort:
         return DOMException::create(AbortError, webError->message);
-    case WebPushError::ErrorTypeNetwork:
-        return DOMException::create(NetworkError, webError->message);
-    case WebPushError::ErrorTypeNotFound:
+    case WebSyncError::ErrorTypeNoPermission:
+        return DOMException::create(InvalidAccessError, webError->message);
+    case WebSyncError::ErrorTypeNotFound:
         return DOMException::create(NotFoundError, webError->message);
-    case WebPushError::ErrorTypeUnknown:
+    case WebSyncError::ErrorTypeUnknown:
         return DOMException::create(UnknownError, webError->message);
     }
     ASSERT_NOT_REACHED();
     return DOMException::create(UnknownError);
 }
 
-void PushError::dispose(WebType* webErrorRaw)
+void SyncError::dispose(WebType* webErrorRaw)
 {
     delete webErrorRaw;
 }