OOPIF: History navigations for new child frames.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 70c881825f8883a6db53263dc9f27def90943d4f..90ec70cf56c1d2cc0f27b2c0e60aca1f2f3c011d 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -802,6 +802,17 @@ void RenderFrameHostImpl::OnFrameFocused() {
 }
 
 void RenderFrameHostImpl::OnOpenURL(const FrameHostMsg_OpenURL_Params& params) {
+  if (params.is_history_navigation_in_new_child) {
+    DCHECK(SiteIsolationPolicy::UseSubframeNavigationEntries());
+
+    // Try to find a FrameNavigationEntry that matches this frame instead, based
+    // on the frame's unique name.  If this can't be found, fall back to the
+    // default params using OpenURL below.
+    if (frame_tree_node_->navigator()->NavigateNewChildFrame(
+            this, params.frame_unique_name))
+      return;
+  }
+
   OpenURL(params, GetSiteInstance());
 }