Add support for blob urls for subresources.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 8ff540e93bfe07d49b3cacacc4f1a6987ea39c47..9429e7b4456774e1baf6273448bd1ea3966fce83 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -4297,7 +4297,18 @@ void RenderFrameImpl::WillSendRequest(blink::WebURLRequest& request) {
     }
   }
 
-  extra_data->set_url_loader_factory_override(url_loader_factory_.get());
+  // TODO: generalize how non-network schemes are sent to the renderer and used.
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableNetworkService)) {
+    if (request.Url().ProtocolIs(url::kBlobScheme)) {
+      extra_data->set_url_loader_factory_override(
+          RenderThreadImpl::current()->GetBlobURLLoaderFactory());
+    }
+  }
+
+  if (!extra_data->url_loader_factory_override())
+    extra_data->set_url_loader_factory_override(url_loader_factory_.get());
+
   // TODO(kinuko, yzshen): We need to set up throttles for some worker cases
   // that don't go through here.
   extra_data->set_url_loader_throttles(std::move(throttles));