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

content/browser/renderer_host/render_view_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 1438 matching lines @@
   }
 #endif
 }
 
 bool RenderViewHostImpl::CanAccessFilesOfPageState(
     const PageState& state) const {
   ChildProcessSecurityPolicyImpl* policy =
       ChildProcessSecurityPolicyImpl::GetInstance();
 
   const std::vector<base::FilePath>& file_paths = state.GetReferencedFiles();
-  for (std::vector<base::FilePath>::const_iterator file = file_paths.begin();
-       file != file_paths.end(); ++file) {
-    if (!policy->CanReadFile(GetProcess()->GetID(), *file))
+  for (const auto& file : file_paths) {
+    if (!policy->CanReadFile(GetProcess()->GetID(), file))
       return false;
   }
   return true;
 }
 
+void RenderViewHostImpl::GrantFileAccessFromPageState(const PageState& state) {
+  ChildProcessSecurityPolicyImpl* policy =
+      ChildProcessSecurityPolicyImpl::GetInstance();
+
+  const std::vector<base::FilePath>& file_paths = state.GetReferencedFiles();
+  for (const auto& file : file_paths) {
+    if (!policy->CanReadFile(GetProcess()->GetID(), file))
+      policy->GrantReadFile(GetProcess()->GetID(), file);
+  }
+}
+
 void RenderViewHostImpl::AttachToFrameTree() {
   FrameTree* frame_tree = delegate_->GetFrameTree();
 
   frame_tree->ResetForMainFrameSwap();
 }
 
 void RenderViewHostImpl::SelectWordAroundCaret() {
   Send(new ViewMsg_SelectWordAroundCaret(GetRoutingID()));
 }
 
 }  // namespace content