Flag for D3DVsync feature on chrome://flags

chrome/browser/flag_descriptions.h

Index: chrome/browser/flag_descriptions.h
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 0e28065dd02dc01e4841ff413ba09e5918581596..5248f36b27b5b9d2e5c1f738758ec6758d5ad02a 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -3407,6 +3407,14 @@ extern const char kLocationHardReloadDescription[];
 extern const char kCaptureThumbnailOnLoadFinishedName[];
 extern const char kCaptureThumbnailOnLoadFinishedDescription[];
 
+#if defined(OS_WIN)
+
+// Name and description of the flag that enables D3D v-sync.
+extern const char kEnableD3DVsync[];
+extern const char kEnableD3DVsyncDescription[];
+
+#endif  // defined(OS_WIN)
+
 }  // namespace flag_descriptions
 
 #endif  // CHROME_BROWSER_FLAG_DESCRIPTIONS_H_