Added some basic WebVR use counters

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/dom/DOMException.h"
 #include "core/dom/Fullscreen.h"
+#include "core/frame/UseCounter.h"
 #include "core/inspector/ConsoleMessage.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"
@@ skipping 71 matching lines @@
         return false;
 
     if (m_depthNear == m_depthFar)
         return false;
 
     return frameData->update(m_framePose, m_eyeParametersLeft, m_eyeParametersRight, m_depthNear, m_depthFar);
 }
 
 VRPose* VRDisplay::getPose()
 {
+    Document* document = m_navigatorVR->document();
+    if (document)
+        UseCounter::count(*document, UseCounter::VRDeprecatedGetPose);
+
     updatePose();
 
     if (!m_framePose)
         return nullptr;
 
     VRPose* pose = VRPose::create();
     pose->setPose(m_framePose);
     return pose;
 }
 
@@ skipping 138 matching lines @@
         forceExitPresent();
         DOMException* exception = DOMException::create(InvalidStateError, "VR Presentation not implemented for this VRDisplay.");
         resolver->reject(exception);
         return;
     }
 
     m_isPresenting = true;
 
     updateLayerBounds();
 
+    Document* document = m_navigatorVR->document();
+    if (document)
+        UseCounter::count(*document, UseCounter::VRPresent);
+
     resolver->resolve();
     m_navigatorVR->fireVRDisplayPresentChange(this);
 }
 
 void VRDisplay::forceExitPresent()
 {
     if (m_isPresenting) {
         if (!m_capabilities->hasExternalDisplay()) {
             Fullscreen::fullyExitFullscreen(m_layer.source()->document());
             m_fullscreenCheckTimer.stop();
@@ skipping 77 matching lines @@
 {
     visitor->trace(m_navigatorVR);
     visitor->trace(m_capabilities);
     visitor->trace(m_stageParameters);
     visitor->trace(m_eyeParametersLeft);
     visitor->trace(m_eyeParametersRight);
     visitor->trace(m_layer);
 }
 
 } // namespace blink