1 files changed, 51 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/offscreencanvas/context-lost-restored-worker.js b/dom/canvas/test/webgl-conf/checkout/conformance/offscreencanvas/context-lost-restored-worker.js
new file mode 100644
index 0000000000..76f59dce7e
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/offscreencanvas/context-lost-restored-worker.js
@@ -0,0 +1,51 @@
+/*
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+*/
+
+importScripts("../../js/tests/canvas-tests-utils.js");
+self.onmessage = function(e) {
+    if (!setupTest())
+        self.postMessage("Test failed");
+
+    canvas.addEventListener("webglcontextlost", function(e) {
+        if (!testLostContext(e))
+            self.postMessage("Test failed");
+        // restore the context after this event has exited.
+        setTimeout(function() {
+            // we didn't call prevent default so we should not be able to restore the context
+            if (!compareGLError(gl.INVALID_OPERATION, "WEBGL_lose_context.restoreContext()"))
+                self.postMessage("Test failed");
+            testLosingAndRestoringContext().then(function() {
+                self.postMessage("Test passed");
+            }, function() {
+                self.postMessage("Test failed");
+            });
+        }, 0);
+    });
+    canvas.addEventListener("webglcontextrestored", function() {
+        self.postMessage("Test failed");
+    });
+    allowRestore = false;
+    contextLostEventFired = false;
+    contextRestoredEventFired = false;
+
+    if (!testOriginalContext())
+        self.postMessage("Test failed");
+    WEBGL_lose_context.loseContext();
+    // The context should be lost immediately.
+    if (!gl.isContextLost())
+        self.postMessage("Test failed");
+    if (gl.getError() != gl.CONTEXT_LOST_WEBGL)
+        self.postMessage("Test failed");
+    if (gl.getError() != gl.NO_ERROR)
+        self.postMessage("Test failed");
+    // gl methods should be no-ops
+    if (!compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)"))
+        self.postMessage("Test failed");
+    // but the event should not have been fired.
+    if (contextLostEventFired)
+        self.postMessage("Test failed");
+}
+