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 1869 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 3754 matching lines @@
     RenderViewHost* render_view_host = RenderViewHost::From(render_widget_host);
     if (!render_view_host)
       continue;
     render_view_host_set.insert(render_view_host);
   }
   for (RenderViewHost* render_view_host : render_view_host_set)
     render_view_host->OnWebkitPreferencesChanged();
 }
 
 }  // namespace content