Fix loading placeholders for Lo-Fi

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index b9349cf934c88c3e536bfed6755d723f2ff9b670..c1e3c21c19c1d22b5593beeaacda032c35b03f7f 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -636,6 +636,9 @@ IPC_MESSAGE_ROUTED0(FrameMsg_ChildFrameProcessGone)
 IPC_MESSAGE_ROUTED1(FrameMsg_ContextMenuClosed,
                     content::CustomContextMenuContext /* custom_context */)
 
+// Disables loading Lo-Fi images in the RenderFrame.
+IPC_SYNC_MESSAGE_ROUTED0_0(FrameMsg_DisableLoFiImages)

[nasko, 2016/07/12 19:03:57]

Why is this a sync message? Sync messages should never be sent from the browser
to the renderer, as it allows any malicious renderer to hang the entire browser.

[Charlie Reis, 2016/07/12 19:17:06]

It also makes deadlock possible, because the renderer can be sending sync IPCs
to the browser at the same time.

+
 // Reloads all the Lo-Fi images in the RenderFrame. Ignores the cache and
 // reloads from the network.
 IPC_MESSAGE_ROUTED0(FrameMsg_ReloadLoFiImages)