Replicating WebFrame::uniqueName across renderers.

third_party/WebKit/Source/web/WebFrame.cpp

Index: third_party/WebKit/Source/web/WebFrame.cpp
diff --git a/third_party/WebKit/Source/web/WebFrame.cpp b/third_party/WebKit/Source/web/WebFrame.cpp
index 5ea8859a994337fe5625a063aa2bd1263aa77c5f..338b4610d0e5bf1ea0b39a709a44c1d8ac6c3138 100644
--- a/third_party/WebKit/Source/web/WebFrame.cpp
+++ b/third_party/WebKit/Source/web/WebFrame.cpp
@@ -70,6 +70,7 @@ bool WebFrame::swap(WebFrame* frame)
 
     FrameHost* host = oldFrame->host();
     AtomicString name = oldFrame->tree().name();
+    AtomicString uniqueName = oldFrame->tree().uniqueName();
     FrameOwner* owner = oldFrame->owner();
     oldFrame->disconnectOwnerElement();
 
@@ -101,7 +102,7 @@ bool WebFrame::swap(WebFrame* frame)
             localFrame.page()->setMainFrame(&localFrame);
         }
     } else {
-        toWebRemoteFrameImpl(frame)->initializeCoreFrame(host, owner, name, nullAtom);
+        toWebRemoteFrameImpl(frame)->initializeCoreFrame(host, owner, name, uniqueName);
     }
 
     frame->toImplBase()->frame()->windowProxyManager()->setGlobals(globals);