Don't create layout objects for children of display-none iframes.

third_party/WebKit/Source/web/RemoteFrameOwner.h

 // Copyright 2015 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.
 
 #ifndef RemoteFrameOwner_h
 #define RemoteFrameOwner_h
 
 #include "core/frame/FrameOwner.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "public/web/WebFrameOwnerProperties.h"
@@ skipping 23 matching lines @@
   SandboxFlags getSandboxFlags() const override { return m_sandboxFlags; }
   void setSandboxFlags(SandboxFlags flags) { m_sandboxFlags = flags; }
   void dispatchLoad() override;
   // TODO(dcheng): Implement.
   bool canRenderFallbackContent() const override { return false; }
   void renderFallbackContent() override {}
   ScrollbarMode scrollingMode() const override { return m_scrolling; }
   int marginWidth() const override { return m_marginWidth; }
   int marginHeight() const override { return m_marginHeight; }
   bool allowFullscreen() const override { return m_allowFullscreen; }
+  bool isDisplayNone() const override { return m_isDisplayNone; }
   AtomicString csp() const override { return m_csp; }
   const WebVector<WebPermissionType>& delegatedPermissions() const override {
     return m_delegatedPermissions;
   }
 
   void setScrollingMode(WebFrameOwnerProperties::ScrollingMode);
   void setMarginWidth(int marginWidth) { m_marginWidth = marginWidth; }
   void setMarginHeight(int marginHeight) { m_marginHeight = marginHeight; }
   void setAllowFullscreen(bool allowFullscreen) {
     m_allowFullscreen = allowFullscreen;
   }
+  void setIsDisplayNone(bool isDisplayNone) { m_isDisplayNone = isDisplayNone; }
   void setCsp(const WebString& csp) { m_csp = csp; }
   void setDelegatedpermissions(
       const WebVector<WebPermissionType>& delegatedPermissions) {
     m_delegatedPermissions = delegatedPermissions;
   }
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   RemoteFrameOwner(SandboxFlags, const WebFrameOwnerProperties&);
 
   // Intentionally private to prevent redundant checks when the type is
   // already HTMLFrameOwnerElement.
   bool isLocal() const override { return false; }
   bool isRemote() const override { return true; }
 
   Member<Frame> m_frame;
   SandboxFlags m_sandboxFlags;
   ScrollbarMode m_scrolling;
   int m_marginWidth;
   int m_marginHeight;
   bool m_allowFullscreen;
+  bool m_isDisplayNone;
   WebString m_csp;
   WebVector<WebPermissionType> m_delegatedPermissions;
 };
 
 DEFINE_TYPE_CASTS(RemoteFrameOwner,
                   FrameOwner,
                   owner,
                   owner->isRemote(),
                   owner.isRemote());
 
 }  // namespace blink
 
 #endif  // RemoteFrameOwner_h