Add switch to disable WebVR gesture requirement

third_party/WebKit/Source/modules/vr/VRDisplay.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/vr/VRDisplay.h"
 
 #include "core/css/StylePropertySet.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/DocumentUserGestureToken.h"
 #include "core/dom/FrameRequestCallback.h"
 #include "core/dom/Fullscreen.h"
 #include "core/dom/ScriptedAnimationController.h"
 #include "core/frame/UseCounter.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "modules/vr/NavigatorVR.h"
 #include "modules/vr/VRController.h"
 #include "modules/vr/VRDisplayCapabilities.h"
 #include "modules/vr/VREyeParameters.h"
 #include "modules/vr/VRFrameData.h"
 #include "modules/vr/VRLayer.h"
 #include "modules/vr/VRPose.h"
 #include "modules/vr/VRStageParameters.h"
 #include "modules/webgl/WebGLRenderingContextBase.h"
 #include "platform/Histogram.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/UserGestureIndicator.h"
 #include "public/platform/Platform.h"
 #include "wtf/AutoReset.h"
 
 namespace blink {
 
 namespace {
 
 VREye stringToVREye(const String& whichEye) {
   if (whichEye == "left")
@@ skipping 231 matching lines @@
   // request.
   if (!m_capabilities->canPresent()) {
     DOMException* exception =
         DOMException::create(InvalidStateError, "VRDisplay cannot present.");
     resolver->reject(exception);
     ReportPresentationResult(PresentationResult::VRDisplayCannotPresent);
     return promise;
   }
 
   bool firstPresent = !m_isPresenting;
+  bool gesturesDisabled =
+      RuntimeEnabledFeatures::webVrGesturesDisabledEnabled();

[bokan, 2016/11/30 22:29:11]

Perhaps a better name might be webVrWithoutUserGestures? Or flip the meaning and
webVrNeedsUserGestures? IMO having DisabledEnabled is awkward.

[bsheedy, 2016/11/30 22:45:29]

Done.

 
   // Initiating VR presentation is only allowed in response to a user gesture.
   // If the VRDisplay is already presenting, however, repeated calls are
   // allowed outside a user gesture so that the presented content may be
   // updated.
-  if (firstPresent && !UserGestureIndicator::utilizeUserGesture()) {
+  if (firstPresent && !UserGestureIndicator::utilizeUserGesture() &&
+      !gesturesDisabled) {
     DOMException* exception = DOMException::create(
         InvalidStateError, "API can only be initiated by a user gesture.");
     resolver->reject(exception);
     ReportPresentationResult(PresentationResult::NotInitiatedByUserGesture);
     return promise;
   }
 
   // A valid number of layers must be provided in order to present.
   if (layers.size() == 0 || layers.size() > m_capabilities->maxLayers()) {
     forceExitPresent();
@@ skipping 378 matching lines @@
   visitor->trace(m_capabilities);
   visitor->trace(m_stageParameters);
   visitor->trace(m_eyeParametersLeft);
   visitor->trace(m_eyeParametersRight);
   visitor->trace(m_layer);
   visitor->trace(m_renderingContext);
   visitor->trace(m_scriptedAnimationController);
 }
 
 }  // namespace blink