PlzNavigate: Get StreamPrivate API to work.

content/public/browser/resource_request_info.h

Index: content/public/browser/resource_request_info.h
diff --git a/content/public/browser/resource_request_info.h b/content/public/browser/resource_request_info.h
index 37a8c8ef8fd1fb0af81a4b886154e68b43dc4e64..e03cc52e516a3706be7236e525fda9452bf33378 100644
--- a/content/public/browser/resource_request_info.h
+++ b/content/public/browser/resource_request_info.h
@@ -95,6 +95,10 @@ class ResourceRequestInfo {
   // another process.  Otherwise it is 0.
   virtual int GetOriginPID() const = 0;
 
+  // Returns the FrameTreeNode ID for this frame. This ID is browser-global and
+  // uniquely identifies a frame that hosts content.
+  virtual int GetFrameTreeNodeId() const = 0;
+
   // The IPC route identifier of the RenderFrame.
   // To get a WebContents, use GetWebContentsGetterForRequest instead.
   // TODO(jam): once all navigation and resource requests are sent between