# HG changeset patch
# Parent fae4a63127468bd6447453495c82b9f6713888fb

diff --git a/content/canvas/test/webgl/conformance/extensions/oes-standard-derivatives.html b/content/canvas/test/webgl/conformance/extensions/oes-standard-derivatives.html
--- a/content/canvas/test/webgl/conformance/extensions/oes-standard-derivatives.html
+++ b/content/canvas/test/webgl/conformance/extensions/oes-standard-derivatives.html
@@ -116,16 +116,17 @@ if (!gl) {
         testPassed("Successfully enabled OES_standard_derivatives extension");
 
         runSupportedTest(true);
 
         runHintTestEnabled();
         runShaderTests(true);
         runOutputTests();
         runUniqueObjectTest();
+        runReferenceCycleTest();
     }
 }
 
 function runSupportedTest(extensionEnabled) {
     var supported = gl.getSupportedExtensions();
     if (supported.indexOf("OES_standard_derivatives") >= 0) {
         if (extensionEnabled) {
             testPassed("OES_standard_derivatives listed as supported and getExtension succeeded");
@@ -365,16 +366,30 @@ function runUniqueObjectTest()
     } else if (window.opera && window.opera.collect) {
         window.opera.collect();
     } else {
         attemptToForceGC();
     }
     shouldBe('gl.getExtension("OES_standard_derivatives").myProperty', '2');
 }
 
+function runReferenceCycleTest()
+{
+    // create some reference cycles. The goal is to see if they cause leaks. The point is that
+    // some browser test runners have instrumentation to detect leaked refcounted objects.
+
+    debug("Testing reference cycles between context and extension objects");
+    var ext = gl.getExtension("OES_standard_derivatives");
+
+    // create cycle between extension and context, since the context has to hold a reference to the extension
+    ext.context = gl;
+
+    // create a self-cycle on the extension object
+    ext.ext = ext;
+}
 
 debug("");
 successfullyParsed = true;
 </script>
 <script>finishTest();</script>
 
 </body>
 </html>
diff --git a/content/canvas/test/webgl/conformance/extensions/oes-texture-float.html b/content/canvas/test/webgl/conformance/extensions/oes-texture-float.html
--- a/content/canvas/test/webgl/conformance/extensions/oes-texture-float.html
+++ b/content/canvas/test/webgl/conformance/extensions/oes-texture-float.html
@@ -81,16 +81,17 @@ if (!gl) {
 
   if (!gl.getExtension("OES_texture_float")) {
       testPassed("No OES_texture_float support -- this is legal");
   } else {
       testPassed("Successfully enabled OES_texture_float extension");
       runTextureCreationTest(testProgram, true);
       runRenderTargetTest(testProgram);
       runUniqueObjectTest();
+      runReferenceCycleTest();
   }
 }
 
 // Needs to be global for shouldBe to see it.
 var pixels;
 
 function allocateTexture()
 {
@@ -206,16 +207,30 @@ function runUniqueObjectTest()
     } else if (window.opera && window.opera.collect) {
         window.opera.collect();
     } else {
         attemptToForceGC();
     }
     shouldBe('gl.getExtension("OES_texture_float").myProperty', '2');
 }
 
+function runReferenceCycleTest()
+{
+    // create some reference cycles. The goal is to see if they cause leaks. The point is that
+    // some browser test runners have instrumentation to detect leaked refcounted objects.
+
+    debug("Testing reference cycles between context and extension objects");
+    var ext = gl.getExtension("OES_texture_float");
+
+    // create cycle between extension and context, since the context has to hold a reference to the extension
+    ext.context = gl;
+
+    // create a self-cycle on the extension object
+    ext.ext = ext;
+}
 
 debug("");
 successfullyParsed = true;
 </script>
 <script>finishTest();</script>
 
 </body>
 </html>