Add RequestOSFileHandle as a private PPAPI

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index f3e632f1e60b89417a0c82129c7d5c6c04d28da8..995529ce9a85d9926641acfb6d637133d79b6d76 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -110,6 +110,7 @@
 #include "content/public/browser/web_contents_view.h"
 #include "content/public/common/child_process_host.h"
 #include "content/public/common/content_descriptors.h"
+#include "content/public/common/content_switches.h"
 #include "extensions/common/constants.h"
 #include "grit/generated_resources.h"
 #include "grit/ui_resources.h"
@@ -1150,6 +1151,7 @@ void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
 
     // Please keep this in alphabetical order.
     static const char* const kSwitchNames[] = {
+      switches::kAllowGetOSFileHandleAPI,
       switches::kAllowHTTPBackgroundPage,
       switches::kAllowLegacyExtensionManifests,
       switches::kAllowScriptingGallery,