Force resize event to be sent to OOPIF subframes when main frame resizes.

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <stddef.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 1863 matching lines @@
     RenderWidgetHostImpl* render_widget_host,
     bool width_changed) {
   RenderFrameHostImpl* rfh = GetMainFrame();
   if (!rfh || render_widget_host != rfh->GetRenderWidgetHost())
     return;
 
   ScreenInfo screen_info;
   GetScreenInfo(&screen_info);
   SendPageMessage(new PageMsg_UpdateScreenInfo(MSG_ROUTING_NONE, screen_info));
 
+  // Send resize message to subframes.
+  for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
+    if (view != rfh->GetView())
+      view->GetRenderWidgetHost()->WasResized();
+  }
+
   for (auto& observer : observers_)
     observer.MainFrameWasResized(width_changed);
 }
 
 void WebContentsImpl::ScreenInfoChanged() {
   if (browser_plugin_embedder_)
     browser_plugin_embedder_->ScreenInfoChanged();
 }
 
 KeyboardEventProcessingResult WebContentsImpl::PreHandleKeyboardEvent(
@@ skipping 3814 matching lines @@
     new_root->SetOriginalOpener(opener->frame_tree()->root());
 
     if (!opener_suppressed) {
       new_root->SetOpener(opener);
       created_with_opener_ = true;
     }
   }
 }
 
 }  // namespace content