Force new surface on BrowserPluginGuest reattach.

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index 22696314621b4af82d931e56373010603b803114..048a916b65f9ad40e4a03f1c23784feff72e4b55 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -78,6 +78,7 @@ BrowserPluginGuest::BrowserPluginGuest(bool has_render_view,
     : WebContentsObserver(web_contents),
       owner_web_contents_(nullptr),
       attached_(false),
+      has_attached_since_surface_set_(false),
       browser_plugin_instance_id_(browser_plugin::kInstanceIDNone),
       focused_(false),
       mouse_locked_(false),
@@ -404,6 +405,7 @@ void BrowserPluginGuest::SetChildFrameSurface(
     const gfx::Size& frame_size,
     float scale_factor,
     const cc::SurfaceSequence& sequence) {
+  has_attached_since_surface_set_ = false;
   SendMessageToEmbedder(new BrowserPluginMsg_SetChildFrameSurface(
       browser_plugin_instance_id(), surface_id, frame_size, scale_factor,
       sequence));
@@ -711,6 +713,7 @@ void BrowserPluginGuest::OnWillAttachComplete(
   InitInternal(params, embedder_web_contents);
 
   attached_ = true;
+  has_attached_since_surface_set_ = true;
   SendQueuedMessages();
 
   delegate_->DidAttach(GetGuestProxyRoutingID());