Paint invalidation tests for slimming paint v2

LayoutTests/paint/invalidation/spv2/resources/paint-invalidation-test.js

+// Asynchronous tests should manually call finishPaintInvalidationTest at the appropriate time.
+window.testIsAsync = false;
+
+// All paint invalidation tests are asynchronous from test-runner's point of view.
+if (window.testRunner)
+    testRunner.waitUntilDone();
+
+function runPaintInvalidationTest()
+{
+    if (!window.testRunner || !window.internals) {
+        setTimeout(paintInvalidationTest, 500);
+        return;
+    }
+
+    // TODO(enne): this is a workaround for multiple svg onload events.
+    // See: http://crbug.com/372946
+    if (window.hasRunPaintInvalidationTest)
+        return;
+    window.hasRunPaintInvalidationTest = true;
+
+    testRunner.layoutAndPaintAsyncThen(function()
+    {
+        window.internals.startTrackingPaintInvalidationObjects();
+        paintInvalidationTest();
+        if (!window.testIsAsync)
+            finishPaintInvalidationTest();
+    });
+}
+
+function removeAllChildren(element)
+{
+    while (element.firstChild)
+        element.removeChild(element.firstChild);
+}
+
+function finishPaintInvalidationTest()
+{
+    if (!window.testRunner || !window.internals)
+        return;
+
+    testRunner.layoutAndPaintAsyncThen(function()
+    {
+        document.body.offsetTop;
+        var paintInvalidationObjects = JSON.stringify(internals.trackedPaintInvalidationObjects());
+        var expectedPaintInvalidationObjects = JSON.stringify(window.expectedPaintInvalidationObjects);
+        internals.stopTrackingPaintInvalidationObjects();
+
+        if (paintInvalidationObjects != expectedPaintInvalidationObjects) {
+            var message = 'Paint invalidation objects mismatch.'
+                + '\nExpected:\n' + expectedPaintInvalidationObjects.replace(/","/g, '",\n "')
+                + '\nActual:\n' + paintInvalidationObjects.replace(/","/g, '",\n "');
+            testRunner.logToStderr(message);
+            while (document.body.firstChild)
+                document.body.removeChild(document.body.firstChild);
+            var pre = document.createElement('pre');
+            pre.appendChild(document.createTextNode('(To copy results as text, see stderr.)\n\n' + message));
+            document.body.appendChild(pre);
+        }
+        testRunner.notifyDone();
+    });
+}
+
+setTimeout(function() {
+    testRunner.notifyDone();
+}, 2000);