ScreenOrientationController: task-based dispatching of change events.

LayoutTests/screen_orientation/page-visibility.html

Index: LayoutTests/screen_orientation/page-visibility.html
diff --git a/LayoutTests/screen_orientation/page-visibility.html b/LayoutTests/screen_orientation/page-visibility.html
index 51d9708da10cead09c11f5fd76383eec679a6b92..73c19e4cf23e52428171d497c9b656c0fa7455a5 100644
--- a/LayoutTests/screen_orientation/page-visibility.html
+++ b/LayoutTests/screen_orientation/page-visibility.html
@@ -12,11 +12,16 @@ var orientationUnchangeHiddenTest = async_test("Test that screen.orientation kee
 var orientationUpdateVisibleTest = async_test("Test that screen.orientation is updated once the page is visible again.");
 var frameEventsTest = async_test("Test that the iframe got as many events as the main frame.");
 
+var orientationChangeContinuation = null;
 var orientationChangeEventListenerCalls = 0;
 var orientationChangeEventListenerCallsForFrame = 0;
 
 screen.orientation.addEventListener('change', function() {
     orientationChangeEventListenerCalls++;
+    if (orientationChangeEventContinuation) {
+        setTimeout(orientationChangeEventContinuation);
+        orientationChangeEventContinuation = null;
+    }
 });
 
 window.frames[0].screen.orientation.addEventListener('change', function() {
@@ -31,7 +36,7 @@ function runEventVisibleTest() {
     if (window.testRunner)
         window.testRunner.setMockScreenOrientation("landscape-primary");
 
-    setTimeout(function() {
+    orientationChangeEventContinuation = function() {
         eventVisibleTest.step(function() {
             assert_equals(orientationChangeEventListenerCalls, 1);
             assert_equals(screen.orientation.type, "landscape-primary");
@@ -39,7 +44,7 @@ function runEventVisibleTest() {
         eventVisibleTest.done();
 
         runNoEventHiddenTest();
-    });
+    };
 }
 
 function runNoEventHiddenTest() {
@@ -53,14 +58,12 @@ function runNoEventHiddenTest() {
     if (window.testRunner)
         window.testRunner.setMockScreenOrientation("portrait-primary");
 
-    setTimeout(function() {
-        noEventHiddenTest.step(function() {
-            assert_equals(orientationChangeEventListenerCalls, 1);
-        });
-        noEventHiddenTest.done();
-
-        runOrientationUnchangeHiddenTest();
+    noEventHiddenTest.step(function() {
+        assert_equals(orientationChangeEventListenerCalls, 1);
     });
+    noEventHiddenTest.done();
+
+    runOrientationUnchangeHiddenTest();
 }
 
 function runOrientationUnchangeHiddenTest() {
@@ -76,7 +79,7 @@ function runOrientationUpdateVisibleTest() {
     if (window.testRunner)
         testRunner.setPageVisibility("visible");
 
-    setTimeout(function() {
+    orientationChangeEventContinuation = function() {
         orientationUpdateVisibleTest.step(function() {
             assert_false(document.hidden);
             // A change event should have been fired.
@@ -88,7 +91,7 @@ function runOrientationUpdateVisibleTest() {
         orientationUpdateVisibleTest.done();
 
         runFrameEventsTest();
-    });
+    };
 }
 
 function runFrameEventsTest() {