OOPIF: Use the same uniqueName when swapping between local and remote.

third_party/WebKit/Source/core/page/FrameTree.h

Index: third_party/WebKit/Source/core/page/FrameTree.h
diff --git a/third_party/WebKit/Source/core/page/FrameTree.h b/third_party/WebKit/Source/core/page/FrameTree.h
index e3554e42e9de4d2ad07f4665925e852cec393a74..37493906a646304b783ede027f16b6efaf73bbdf 100644
--- a/third_party/WebKit/Source/core/page/FrameTree.h
+++ b/third_party/WebKit/Source/core/page/FrameTree.h
@@ -42,6 +42,11 @@ public:
     // |fallbackName| is used as a source of uniqueName.
     void setName(const AtomicString& name, const AtomicString& fallbackName = nullAtom);
 
+    // Directly assigns both the name and uniqueName. Should only be used when
+    // switching between LocalFrames and RemoteFrames for the same logical frame
+    // so that the unique name stays unique.
+    void setNameForReplacementFrame(const AtomicString& name, const AtomicString& uniqueName);
+
     Frame* parent() const;
     Frame* top() const;
     Frame* previousSibling() const;