Propagate inert state to OOPIFs when a modal dialog is active

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

Index: third_party/WebKit/Source/core/frame/Frame.cpp
diff --git a/third_party/WebKit/Source/core/frame/Frame.cpp b/third_party/WebKit/Source/core/frame/Frame.cpp
index 0e153cdd345344c72190f0d1ca3e259aa6ea1e1b..f2f0b194263094abcfb9dd8d8421754f96e574c2 100644
--- a/third_party/WebKit/Source/core/frame/Frame.cpp
+++ b/third_party/WebKit/Source/core/frame/Frame.cpp
@@ -193,6 +193,19 @@ bool Frame::IsFeatureEnabled(WebFeaturePolicyFeature feature) const {
   return feature_policy->IsFeatureEnabled(feature);
 }
 
+void Frame::SetOwner(FrameOwner* owner) {
+  owner_ = owner;
+  UpdateInertIfPossible();
+}
+
+void Frame::UpdateInertIfPossible() {
+  if (owner_ && owner_->IsLocal()) {
+    ToHTMLFrameOwnerElement(owner_)->UpdateDistribution();
+    if (ToHTMLFrameOwnerElement(owner_)->IsInert())
+      SetIsInert(true);
+  }
+}
+
 Frame::Frame(FrameClient* client,
              Page& page,
              FrameOwner* owner,