diff -r 000000000000 -r 6474c204b198 content/canvas/test/webgl-conformance/reference-cycle-test.patch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/canvas/test/webgl-conformance/reference-cycle-test.patch	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,107 @@
+# 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>