Add switch to disable WebVR gesture requirement

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 1668c5a7816c9fd57bad58df9277e38d3a04fefc..51bac28f655644e429c633a9d5996ba4bca694e7 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -304,6 +304,11 @@ const char kDisableWebGLImageChromium[]     = "disable-webgl-image-chromium";
 // Don't enforce the same-origin policy. (Used by people testing their sites.)
 const char kDisableWebSecurity[]            = "disable-web-security";
 
+// Disables WebVR's user gesture requirement in order to present so that
+// automated tests can be run in cases where we cannot mint gesture tokens
+const char kDisableWebVrGestureRequirementForTests[] =
+    "disable-webvr-gesture-requirement-for-tests";
+
 // Disables Blink's XSSAuditor. The XSSAuditor mitigates reflective XSS.
 const char kDisableXSSAuditor[]             = "disable-xss-auditor";