Add FileUtilities::GetFileInfo() to capture file metadata with single IPC

content/browser/renderer_host/file_utilities_message_filter.cc

Index: content/browser/renderer_host/file_utilities_message_filter.cc
diff --git a/content/browser/renderer_host/file_utilities_message_filter.cc b/content/browser/renderer_host/file_utilities_message_filter.cc
index e72916cde00582316531f63c31951cc34c500f73..0f8370aca6021d88304d56da2bdf24664b9ce129 100644
--- a/content/browser/renderer_host/file_utilities_message_filter.cc
+++ b/content/browser/renderer_host/file_utilities_message_filter.cc
@@ -31,6 +31,7 @@ bool FileUtilitiesMessageFilter::OnMessageReceived(const IPC::Message& message,
     IPC_MESSAGE_HANDLER(FileUtilitiesMsg_GetFileSize, OnGetFileSize)
     IPC_MESSAGE_HANDLER(FileUtilitiesMsg_GetFileModificationTime,
                         OnGetFileModificationTime)
+    IPC_MESSAGE_HANDLER(FileUtilitiesMsg_GetFileInfo, OnGetFileInfo)
     IPC_MESSAGE_HANDLER(FileUtilitiesMsg_OpenFile, OnOpenFile)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
@@ -71,6 +72,24 @@ void FileUtilitiesMessageFilter::OnGetFileModificationTime(
     *result = file_info.last_modified;
 }
 
+void FileUtilitiesMessageFilter::OnGetFileInfo(
+    const FilePath& path,
+    base::PlatformFileInfo* result,
+    base::PlatformFileError* status) {
+  *result = base::PlatformFileInfo();
+  *status = base::PLATFORM_FILE_OK;
+
+  // Get file metadata only when the child process has been granted
+  // permission to read the file.
+  if (!ChildProcessSecurityPolicyImpl::GetInstance()->CanReadFile(
+      process_id_, path)) {
+    return;
+  }
+
+  if (!file_util::GetFileInfo(path, result))
+    *status = base::PLATFORM_FILE_ERROR_FAILED;
+}
+
 void FileUtilitiesMessageFilter::OnOpenFile(
     const FilePath& path,
     int mode,