diff -r 000000000000 -r 6474c204b198 browser/devtools/shadereditor/test/browser_webgl-actor-test-15.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/shadereditor/test/browser_webgl-actor-test-15.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,129 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests if program actors are cached when navigating in the bfcache.
+ */
+
+function ifWebGLSupported() {
+  let [target, debuggee, front] = yield initBackend(SIMPLE_CANVAS_URL);
+  front.setup({ reload: false });
+
+  reload(target);
+  let firstProgram = yield once(front, "program-linked");
+  yield checkFirstCachedPrograms(firstProgram);
+  yield checkHighlightingInTheFirstPage(firstProgram);
+  ok(true, "The cached programs behave correctly before the navigation.");
+
+  navigate(target, MULTIPLE_CONTEXTS_URL);
+  let [secondProgram, thirdProgram] = yield getPrograms(front, 2);
+  yield checkSecondCachedPrograms(firstProgram, [secondProgram, thirdProgram]);
+  yield checkHighlightingInTheSecondPage(secondProgram, thirdProgram);
+  ok(true, "The cached programs behave correctly after the navigation.");
+
+  once(front, "program-linked").then(() => {
+    ok(false, "Shouldn't have received any more program-linked notifications.");
+  });
+
+  yield navigateInHistory(target, "back");
+  yield checkFirstCachedPrograms(firstProgram);
+  yield checkHighlightingInTheFirstPage(firstProgram);
+  ok(true, "The cached programs behave correctly after navigating back.");
+
+  yield navigateInHistory(target, "forward");
+  yield checkSecondCachedPrograms(firstProgram, [secondProgram, thirdProgram]);
+  yield checkHighlightingInTheSecondPage(secondProgram, thirdProgram);
+  ok(true, "The cached programs behave correctly after navigating forward.");
+
+  yield navigateInHistory(target, "back");
+  yield checkFirstCachedPrograms(firstProgram);
+  yield checkHighlightingInTheFirstPage(firstProgram);
+  ok(true, "The cached programs behave correctly after navigating back again.");
+
+  yield navigateInHistory(target, "forward");
+  yield checkSecondCachedPrograms(firstProgram, [secondProgram, thirdProgram]);
+  yield checkHighlightingInTheSecondPage(secondProgram, thirdProgram);
+  ok(true, "The cached programs behave correctly after navigating forward again.");
+
+  yield removeTab(target.tab);
+  finish();
+
+  function checkFirstCachedPrograms(programActor) {
+    return Task.spawn(function() {
+      let programs = yield front.getPrograms();
+
+      is(programs.length, 1,
+        "There should be 1 cached program actor.");
+      is(programs[0], programActor,
+        "The cached program actor was the expected one.");
+    })
+  }
+
+  function checkSecondCachedPrograms(oldProgramActor, newProgramActors) {
+    return Task.spawn(function() {
+      let programs = yield front.getPrograms();
+
+      is(programs.length, 2,
+        "There should be 2 cached program actors after the navigation.");
+      is(programs[0], newProgramActors[0],
+        "The first cached program actor was the expected one after the navigation.");
+      is(programs[1], newProgramActors[1],
+        "The second cached program actor was the expected one after the navigation.");
+
+      isnot(newProgramActors[0], oldProgramActor,
+        "The old program actor is not equal to the new first program actor.");
+      isnot(newProgramActors[1], oldProgramActor,
+        "The old program actor is not equal to the new second program actor.");
+    });
+  }
+
+  function checkHighlightingInTheFirstPage(programActor) {
+    return Task.spawn(function() {
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 255, g: 0, b: 0, a: 255 }, true);
+      yield ensurePixelIs(debuggee, { x: 511, y: 511 }, { r: 0, g: 255, b: 0, a: 255 }, true);
+      ok(true, "The corner pixel colors are correct before highlighting.");
+
+      yield programActor.highlight([0, 1, 0, 1]);
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 0, g: 0, b: 0, a: 255 }, true);
+      yield ensurePixelIs(debuggee, { x: 511, y: 511 }, { r: 0, g: 255, b: 0, a: 255 }, true);
+      ok(true, "The corner pixel colors are correct after highlighting.");
+
+      yield programActor.unhighlight();
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 255, g: 0, b: 0, a: 255 }, true);
+      yield ensurePixelIs(debuggee, { x: 511, y: 511 }, { r: 0, g: 255, b: 0, a: 255 }, true);
+      ok(true, "The corner pixel colors are correct after unhighlighting.");
+    });
+  }
+
+  function checkHighlightingInTheSecondPage(firstProgramActor, secondProgramActor) {
+    return Task.spawn(function() {
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 255, g: 255, b: 0, a: 255 }, true, "#canvas1");
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 0, g: 255, b: 255, a: 255 }, true, "#canvas2");
+      yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 255, g: 255, b: 0, a: 255 }, true, "#canvas1");
+      yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 0, g: 255, b: 255, a: 255 }, true, "#canvas2");
+      ok(true, "The two canvases are correctly drawn before highlighting.");
+
+      yield firstProgramActor.highlight([1, 0, 0, 1]);
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 255, g: 0, b: 0, a: 255 }, true, "#canvas1");
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 0, g: 255, b: 255, a: 255 }, true, "#canvas2");
+      yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 255, g: 0, b: 0, a: 255 }, true, "#canvas1");
+      yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 0, g: 255, b: 255, a: 255 }, true, "#canvas2");
+      ok(true, "The first canvas was correctly filled after highlighting.");
+
+      yield secondProgramActor.highlight([0, 1, 0, 1]);
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 255, g: 0, b: 0, a: 255 }, true, "#canvas1");
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 0, g: 255, b: 0, a: 255 }, true, "#canvas2");
+      yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 255, g: 0, b: 0, a: 255 }, true, "#canvas1");
+      yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 0, g: 255, b: 0, a: 255 }, true, "#canvas2");
+      ok(true, "The second canvas was correctly filled after highlighting.");
+
+      yield firstProgramActor.unhighlight();
+      yield secondProgramActor.unhighlight();
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 255, g: 255, b: 0, a: 255 }, true, "#canvas1");
+      yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 0, g: 255, b: 255, a: 255 }, true, "#canvas2");
+      yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 255, g: 255, b: 0, a: 255 }, true, "#canvas1");
+      yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 0, g: 255, b: 255, a: 255 }, true, "#canvas2");
+      ok(true, "The two canvases were correctly filled after unhighlighting.");
+    });
+  }
+}