Replicating WebFrame::uniqueName across renderers.

content/test/test_render_frame_host.cc

Index: content/test/test_render_frame_host.cc
diff --git a/content/test/test_render_frame_host.cc b/content/test/test_render_frame_host.cc
index a842757abb745a2b3878aed7bd1c4ab1a959409b..0b0a95396ed4f321140da5c8882ea00c78fd6a56 100644
--- a/content/test/test_render_frame_host.cc
+++ b/content/test/test_render_frame_host.cc
@@ -4,6 +4,7 @@
 
 #include "content/test/test_render_frame_host.h"
 
+#include "base/guid.h"
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/navigation_handle_impl.h"
 #include "content/browser/frame_host/navigation_request.h"
@@ -83,9 +84,10 @@ void TestRenderFrameHost::InitializeRenderFrameIfNeeded() {
 
 TestRenderFrameHost* TestRenderFrameHost::AppendChild(
     const std::string& frame_name) {
+  std::string frame_unique_name = base::GenerateGUID();
   OnCreateChildFrame(GetProcess()->GetNextRoutingID(),
                      blink::WebTreeScopeType::Document, frame_name,
-                     blink::WebSandboxFlags::None,
+                     frame_unique_name, blink::WebSandboxFlags::None,
                      blink::WebFrameOwnerProperties());
   return static_cast<TestRenderFrameHost*>(
       child_creation_observer_.last_created_frame());