ServiceWorker: Make a way to retrieve a service worker version id (Chromium)

This is used to make a key of MemoryCache:
https://codereview.chromium.org/640463003/

Blink-side: https://codereview.chromium.org/650033007/

BUG=423219
TEST=n/a

Review URL: https://codereview.chromium.org/669303003

Cr-Commit-Position: refs/heads/master@{#301782}

1 files changed, 11 insertions, 0 deletions

diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 2eac475..802a9bc 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -23,6 +23,7 @@
 #include "content/child/plugin_messages.h"
 #include "content/child/quota_dispatcher.h"
 #include "content/child/request_extra_data.h"
+#include "content/child/service_worker/service_worker_handle_reference.h"
 #include "content/child/service_worker/service_worker_network_provider.h"
 #include "content/child/service_worker/service_worker_provider_context.h"
 #include "content/child/service_worker/web_service_worker_provider_impl.h"
@@ -3267,6 +3268,16 @@ bool RenderFrameImpl::isControlledByServiceWorker(WebDataSource& data_source) {
       kInvalidServiceWorkerHandleId;
 }
 
+int64_t RenderFrameImpl::serviceWorkerID(WebDataSource& data_source) {
+  ServiceWorkerNetworkProvider* provider =
+      ServiceWorkerNetworkProvider::FromDocumentState(
+          DocumentState::FromDataSource(&data_source));
+
+  if (provider->context()->controller())
+    return provider->context()->controller()->version_id();
+  return kInvalidServiceWorkerVersionId;
+}
+
 void RenderFrameImpl::postAccessibilityEvent(const blink::WebAXObject& obj,
                                              blink::WebAXEvent event) {
   HandleWebAccessibilityEvent(obj, event);