tests: Add avm2/focus_root_movie test

This test verifies the behavior of focus and focusrect
on the root movie clip.

tests/tests/swfs/avm2/focus_root_movie/Test.as

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+package {
+
+import flash.display.MovieClip;
+import flash.display.Shape;
+import flash.events.FocusEvent;
+
+[SWF(width="20", height="20", backgroundColor="#000000")]
+public class Test extends MovieClip {
+    public function Test() {
+        super();
+        addChild(newShape(0));
+
+        var root: MovieClip = MovieClip(this.root);
+        root.tabEnabled = true;
+        root.tabIndex = 1;
+        root.focusRect = true;
+        root.buttonMode = true;
+
+        var clip: MovieClip = new MovieClip();
+        clip.tabEnabled = true;
+        clip.tabIndex = 2;
+        clip.focusRect = true;
+        clip.addChild(newShape(1));
+        stage.addChild(clip);
+
+        stage.addEventListener("focusIn", function(obj) {
+            return function (evt: FocusEvent): void {
+                if (evt.relatedObject != null && evt.target != null) {
+                    trace("Focus changed at " + obj.name + ": " + evt.relatedObject.name + " -> " + evt.target.name);
+                }
+            };
+        }(stage));
+
+        stage.focus = clip;
+        trace("After set: " + stage.focus);
+        stage.focus = root;
+        trace("After set: " + stage.focus);
+        trace("=====");
+    }
+
+    function newShape(n: int): Shape {
+        var shape = new Shape();
+        shape.graphics.beginFill(0xFF0000);
+        shape.graphics.drawRect(0, 0, 10, 10);
+        shape.graphics.endFill();
+        shape.x = 10 * n;
+        shape.y = 10 * n;
+        return shape;
+    }
+}
+}

tests/tests/swfs/avm2/focus_root_movie/output.txt

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+After set: [object MovieClip]
+Focus changed at null: instance2 -> root1
+After set: [object Test]
+=====

tests/tests/swfs/avm2/focus_root_movie/test.toml

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+num_ticks = 1
+
+image_comparisons.output.trigger = 1
+
+[player_options]
+with_renderer = { optional = false, sample_count = 1 }