Add disable-gpu-vsync to about:flags

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 44b3f4cf17aa4ec0654d8845eb293f75e5f84ca9..a1291e33a6ae295cd32913f49a59c3a90255cf01 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -23,6 +23,7 @@
 #include "content/browser/user_metrics.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
+#include "ui/gfx/gl/gl_switches.h"
 
 namespace about_flags {
 
@@ -160,6 +161,13 @@ const Experiment kExperiments[] = {
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kShowFPSCounter)
   },
+  {
+    "disable-gpu-vsync",
+    IDS_FLAGS_DISABLE_GPU_VSYNC_NAME,
+    IDS_FLAGS_DISABLE_GPU_VSYNC_DESCRIPTION,
+    kOsAll,
+    SINGLE_VALUE_TYPE(switches::kDisableGpuVsync)
+  },
 #if !defined(GOOGLE_CHROME_BUILD)
   // Only expose this for Chromium builds where users may not have the PDF
   // plugin. Do not give Google Chrome users the option to disable it here.