Propagate inert state to OOPIFs when a modal dialog is active

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

Index: third_party/WebKit/Source/core/frame/Frame.h
diff --git a/third_party/WebKit/Source/core/frame/Frame.h b/third_party/WebKit/Source/core/frame/Frame.h
index 397a47833f9a0a1349d964f791fcc216bae26f9e..9db14ab2dc4d2c122be16089bcf1137bb87ef17a 100644
--- a/third_party/WebKit/Source/core/frame/Frame.h
+++ b/third_party/WebKit/Source/core/frame/Frame.h
@@ -156,6 +156,12 @@ class CORE_EXPORT Frame : public GarbageCollectedFinalized<Frame> {
   // the given frame.
   bool IsFeatureEnabled(WebFeaturePolicyFeature) const;
 
+  // Called to make a frame inert or non-inert. A frame is inert when there
+  // is a modal dialog displayed within an ancestor frame, and this frame
+  // itself is not within the dialog.
+  virtual void SetIsInert(bool) = 0;
+  virtual bool IsInert() const = 0;
+
  protected:
   Frame(FrameClient*, Page&, FrameOwner*, WindowProxyManager*);