Only send vrdisplayactivate events to focused frames

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

 // 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.
 
 #ifndef VRDisplay_h
 #define VRDisplay_h
 
 #include "core/dom/Document.h"
 #include "core/dom/FrameRequestCallback.h"
 #include "core/events/EventTarget.h"
@@ skipping 132 matching lines @@
   unsigned m_displayId = 0;
   String m_displayName;
   bool m_isConnected = false;
   bool m_isPresenting = false;
   bool m_isValidDeviceForPresenting = true;
   Member<VRDisplayCapabilities> m_capabilities;
   Member<VRStageParameters> m_stageParameters;
   Member<VREyeParameters> m_eyeParametersLeft;
   Member<VREyeParameters> m_eyeParametersRight;
   device::mojom::blink::VRPosePtr m_framePose;
-  int16_t m_frameId = -1;
+
+  // This frame ID is vr-specific and is used to track when frames arrive at the
+  // VR compositor so that it knows which poses to use, when to apply bounds
+  // updates, etc.
+  int16_t m_vrFrameId = -1;
   VRLayer m_layer;
   double m_depthNear = 0.01;
   double m_depthFar = 10000.0;
 
   void dispose();
 
   TaskRunnerTimer<VRDisplay> m_fullscreenCheckTimer;
   String m_fullscreenOrigWidth;
   String m_fullscreenOrigHeight;
   gpu::gles2::GLES2Interface* m_contextGL = nullptr;
@@ skipping 32 matching lines @@
   RequestDenied = 12,
   FullscreenNotEnabled = 13,
   PresentationResultMax,  // Must be last member of enum.
 };
 
 void ReportPresentationResult(PresentationResult);
 
 }  // namespace blink
 
 #endif  // VRDisplay_h