Propagate inert state to OOPIFs when a modal dialog is active

third_party/WebKit/Source/core/frame/LocalFrame.h

Index: third_party/WebKit/Source/core/frame/LocalFrame.h
diff --git a/third_party/WebKit/Source/core/frame/LocalFrame.h b/third_party/WebKit/Source/core/frame/LocalFrame.h
index a0435f267707bbb6ec6879d5f1906d2200954a3a..665a8a39a02fbd8492409ddb611a1a7c61d3b8f3 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrame.h
+++ b/third_party/WebKit/Source/core/frame/LocalFrame.h
@@ -125,6 +125,9 @@ class CORE_EXPORT LocalFrame final : public Frame,
   void PrintNavigationWarning(const String&) override;
   bool PrepareForCommit() override;
   void DidChangeVisibilityState() override;
+  // This sets the is_inert_ flag and also recurses through this frame's
+  // subtree, updating the inert bit on all descendant frames.
+  void SetIsInert(bool) override;
 
   void DetachChildren();
   void DocumentAttached();
@@ -252,6 +255,8 @@ class CORE_EXPORT LocalFrame final : public Frame,
 
   std::unique_ptr<WebURLLoader> CreateURLLoader();
 
+  bool IsInert() const { return is_inert_; }
+
   using FrameInitCallback = void (*)(LocalFrame*);
   // Allows for the registration of a callback that is invoked whenever a new
   // LocalFrame is initialized. Callbacks are executed in the order that they
@@ -292,6 +297,8 @@ class CORE_EXPORT LocalFrame final : public Frame,
 
   bool CanNavigateWithoutFramebusting(const Frame&, String& error_reason);
 
+  void PropagateInertToChildFrames();
+
   std::unique_ptr<WebFrameScheduler> frame_scheduler_;
 
   mutable FrameLoader loader_;