Implement CachedMetadata handling on MojoAsyncResourceHandler

content/browser/loader/mojo_async_resource_handler.cc

Index: content/browser/loader/mojo_async_resource_handler.cc
diff --git a/content/browser/loader/mojo_async_resource_handler.cc b/content/browser/loader/mojo_async_resource_handler.cc
index 0d103654468e3923424646aa51031246b07daeef..70fa94a7387857a683bfcd544ed4aaea9ed7ce0d 100644
--- a/content/browser/loader/mojo_async_resource_handler.cc
+++ b/content/browser/loader/mojo_async_resource_handler.cc
@@ -181,6 +181,14 @@ bool MojoAsyncResourceHandler::OnResponseStarted(ResourceResponse* response,
 
   url_loader_client_->OnReceiveResponse(response->head,
                                         std::move(downloaded_file_ptr));
+
+  net::IOBufferWithSize* metadata = GetResponseMetadata(request());
+  if (metadata) {
+    const uint8_t* ptr = reinterpret_cast<const uint8_t*>(metadata->data());
+
+    url_loader_client_->OnReceiveCachedMetadata(
+        std::vector<uint8_t>(ptr, ptr + metadata->size()));
+  }
   return true;
 }
 
@@ -323,6 +331,11 @@ MojoResult MojoAsyncResourceHandler::EndWrite(uint32_t written) {
   return mojo::EndWriteDataRaw(shared_writer_->writer(), written);
 }
 
+net::IOBufferWithSize* MojoAsyncResourceHandler::GetResponseMetadata(
+    net::URLRequest* request) {
+  return request->response_info().metadata.get();
+}
+
 void MojoAsyncResourceHandler::OnResponseCompleted(
     const net::URLRequestStatus& status,
     bool* defer) {