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 dde57604ead2e4bee5f30088a22f35878153e8ab..b0edb2a6220d644a4b144aad09c27d337ee90985 100644
--- a/third_party/WebKit/Source/core/frame/Frame.h
+++ b/third_party/WebKit/Source/core/frame/Frame.h
@@ -98,7 +98,7 @@ class CORE_EXPORT Frame : public GarbageCollectedFinalized<Frame> {
   bool IsLocalRoot() const;
 
   FrameOwner* Owner() const;
-  void SetOwner(FrameOwner* owner) { owner_ = owner; }
+  void SetOwner(FrameOwner*);
   HTMLFrameOwnerElement* DeprecatedLocalOwner() const;
 
   DOMWindow* DomWindow() const { return dom_window_; }
@@ -154,6 +154,12 @@ 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;
+  void UpdateInertIfPossible();
+
  protected:
   Frame(FrameClient*, Page&, FrameOwner*, WindowProxyManager*);
 
@@ -167,6 +173,10 @@ class CORE_EXPORT Frame : public GarbageCollectedFinalized<Frame> {
 
   FrameLifecycle lifecycle_;
 
+  // This is set to true if this is a subframe, and the frame element in the
+  // parent frame's document becomes inert.

[alexmos, 2017/06/20 18:46:10]

nit: Can we also explicitly say that it is always false for main frames?

[kenrb, 2017/06/22 15:33:35]

Done.

+  bool is_inert_ = false;
+
  private:
   Member<FrameClient> client_;
   const Member<WindowProxyManager> window_proxy_manager_;