Upgrade insecure requests: Pipe navigational hosts down into nested documents.

Source/core/loader/FrameLoader.cpp

Index: Source/core/loader/FrameLoader.cpp
diff --git a/Source/core/loader/FrameLoader.cpp b/Source/core/loader/FrameLoader.cpp
index 03a988189bcfd302f5f3a83228627767d21945bb..0c218bcf5a772cdf7ff1766a733cac77091ea9c6 100644
--- a/Source/core/loader/FrameLoader.cpp
+++ b/Source/core/loader/FrameLoader.cpp
@@ -1415,4 +1415,18 @@ SecurityContext::InsecureRequestsPolicy FrameLoader::insecureRequestsPolicy() co
     return toLocalFrame(parentFrame)->document()->insecureRequestsPolicy();
 }
 
+SecurityContext::InsecureNavigationsSet* FrameLoader::insecureNavigationsToUpgrade() const
+{
+    Frame* parentFrame = m_frame->tree().parent();
+    if (!parentFrame)
+        return nullptr;
+
+    // FIXME: We need a way to propagate insecure requests policy flags to
+    // out-of-process frames. For now, we'll always use default behavior.
+    if (!parentFrame->isLocalFrame())
+        return nullptr;
+
+    return toLocalFrame(parentFrame)->document()->insecureNavigationsToUpgrade();
+}
+
 } // namespace blink