Add RequestOSFileHandle as a private PPAPI

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 6e6438ed737d856465afb82152cb020aae60d9c5..14d68e1199817861c592fc2f61e8f6793ba89680 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -37,13 +37,18 @@ const char kAllowHTTPBackgroundPage[]       = "allow-http-background-page";
 const char kAllowLegacyExtensionManifests[] =
     "allow-legacy-extension-manifests";
 
-// Specifies comma-separated list of extension ids to grant access to TCP/UDP
-// socket APIs.
+// Specifies comma-separated list of extension ids or hosts to grant
+// access to TCP/UDP socket APIs.
 const char kAllowNaClSocketAPI[]            = "allow-nacl-socket-api";
 
 // Don't block outdated plugins.
 const char kAllowOutdatedPlugins[]          = "allow-outdated-plugins";
 
+// Specifies command-separated list of extension ids or hosts to grant
+// access to RequestOSFileHandle private API.
+const char kAllowRequestOSFileHandleAPI[]   =
+    "allow-request-os-file-handle-api";
+
 // By default, an https page cannot run JavaScript, CSS or plug-ins from http
 // URLs. This provides an override to get the old insecure behavior.
 const char kAllowRunningInsecureContent[]   = "allow-running-insecure-content";