Grant access to files in PageState, which have already been validated.

content/browser/renderer_host/render_view_host_impl.h

Index: content/browser/renderer_host/render_view_host_impl.h
diff --git a/content/browser/renderer_host/render_view_host_impl.h b/content/browser/renderer_host/render_view_host_impl.h
index c6fdf055b0d0b95348057ca7466421f22af2b5da..bb2013a700d8c2550b4c7b2e66bad14ad2c58442 100644
--- a/content/browser/renderer_host/render_view_host_impl.h
+++ b/content/browser/renderer_host/render_view_host_impl.h
@@ -388,8 +388,16 @@ class CONTENT_EXPORT RenderViewHostImpl
   // to fire.
   static const int64 kUnloadTimeoutMS;
 
+  // Returns whether the current RenderProcessHost has read access to the files
+  // reported in |state|.
   bool CanAccessFilesOfPageState(const PageState& state) const;
 
+  // Grants the current RenderProcessHost read access to any file listed in
+  // |validated_state|.  It is important that the PageState has been validated
+  // upon receipt from the renderer process to prevent it from forging access to
+  // files without the user's consent.
+  void GrantFileAccessFromPageState(const PageState& validated_state);
+
   // The number of RenderFrameHosts which have a reference to this RVH.
   int frames_ref_count_;