Fix for WebView accessible resources.

extensions/renderer/renderer_extension_registry.cc

Index: extensions/renderer/renderer_extension_registry.cc
diff --git a/extensions/renderer/renderer_extension_registry.cc b/extensions/renderer/renderer_extension_registry.cc
index ddc3a1b89f31f89dc6174b7de27b756acb79c293..97e3bea0ace3f1fc9bd3b1a36dcdf4bcb52ad991 100644
--- a/extensions/renderer/renderer_extension_registry.cc
+++ b/extensions/renderer/renderer_extension_registry.cc
@@ -38,6 +38,15 @@ const ExtensionSet* RendererExtensionRegistry::GetMainThreadExtensionSet()
   return &extensions_;
 }
 
+void RendererExtensionRegistry::SetWebviewPartitionID(
+    const std::string& partition_id) {
+  // |webview_partition_id_| cannot be changed once set.
+  DCHECK(webview_partition_id_.empty() ||
+         webview_partition_id_ == partition_id);
+  if (webview_partition_id_.empty())
+    webview_partition_id_ = partition_id;
+}
+
 size_t RendererExtensionRegistry::size() const {
   base::AutoLock lock(lock_);
   return extensions_.size();