Added PPAPI win32k lockdown options to chrome://flags.

content/common/content_switches_internal.cc

Index: content/common/content_switches_internal.cc
diff --git a/content/common/content_switches_internal.cc b/content/common/content_switches_internal.cc
index aa34ca1891396b26dffa3e51ee1f8253b86c3815..c97af030899a5928992b83e9ea44fab921e51dd5 100644
--- a/content/common/content_switches_internal.cc
+++ b/content/common/content_switches_internal.cc
@@ -70,11 +70,10 @@ bool IsWin32kLockdownEnabledForMimeType(const std::string& mime_type) {
   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
 
   std::string mime_types =
-      cmd_line->GetSwitchValueASCII(switches::kEnableWin32kLockDownMimeTypes);
-
-  if (mime_types.empty()) {
+      base::FieldTrialList::FindFullName("EnableWin32kLockDownMimeTypes");
+  if (cmd_line->HasSwitch(switches::kEnableWin32kLockDownMimeTypes)) {
     mime_types =
-        base::FieldTrialList::FindFullName("EnableWin32kLockDownMimeTypes");
+        cmd_line->GetSwitchValueASCII(switches::kEnableWin32kLockDownMimeTypes);
   }
 
   // Consider the value * to enable all mime types for lockdown.