Bug 1274769 - handle the WebGLTimerQuery deletion status for GLContext cleanup. r=jgilbert

dom/canvas/WebGLExtensionBase.cpp

@@ -21,6 +21,8 @@ void
 WebGLExtensionBase::MarkLost()
 {
     mIsLost = true;
+
+    OnMarkLost();
 }
 
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(WebGLExtensionBase)

dom/canvas/WebGLExtensionDisjointTimerQuery.cpp

@@ -249,6 +249,12 @@ WebGLExtensionDisjointTimerQuery::IsSupported(const WebGLContext* webgl)
   // 'sync', we just piggy-back off of 'sync'.
 }
 
+void
+WebGLExtensionDisjointTimerQuery::OnMarkLost()
+{
+  mActiveQuery = nullptr;
+}
+
 IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionDisjointTimerQuery, EXT_disjoint_timer_query)
 
 } // namespace mozilla

dom/canvas/WebGLExtensions.h

@@ -49,6 +49,8 @@ public:
 protected:
     virtual ~WebGLExtensionBase();
 
+    virtual void OnMarkLost() { }
+
     bool mIsLost;
 };
 
@@ -387,6 +389,8 @@ public:
     DECL_WEBGL_EXTENSION_GOOP
 
 private:
+    virtual void OnMarkLost() override;
+
     /**
      * An active TIME_ELAPSED query participating in a begin/end block.
      */