[CSS Regions] Helper functions for selection layout tests

LayoutTests/fast/regions/resources/helper.js

Index: LayoutTests/fast/regions/resources/helper.js
diff --git a/LayoutTests/fast/regions/resources/helper.js b/LayoutTests/fast/regions/resources/helper.js
index 4c290a8536da33ec0d7fd15f7a855934971bfbbc..6cf7d3f6af3ad0268f60138b0723e3deb42d8857 100644
--- a/LayoutTests/fast/regions/resources/helper.js
+++ b/LayoutTests/fast/regions/resources/helper.js
@@ -202,3 +202,41 @@ function compareArrays(current, expected) {
     }
     testPassed("Array ["  + expected.toString() + "] is equal to [" + current.toString() + "]");
 }
+
+function selectContentByRange(fromX, fromY, toX, toY) {
+    if (!window.testRunner)
+        return;
+
+    eventSender.mouseMoveTo(fromX, fromY);
+    eventSender.mouseDown();
+
+    eventSender.mouseMoveTo(toX, toY);
+    eventSender.mouseUp();
+}
+
+function selectContentByIds(fromId, toId) {
+    var fromRect = document.getElementById(fromId).getBoundingClientRect();
+    var toRect = document.getElementById(toId).getBoundingClientRect();
+
+    var fromRectVerticalCenter = fromRect.top + fromRect.height / 2;
+    var toRectVerticalCenter = toRect.top + toRect.height / 2;
+
+    selectContentByRange(fromRect.left, fromRectVerticalCenter, toRect.right, toRectVerticalCenter);
+}
+
+function selectBaseAndExtent(fromId, fromOffset, toId, toOffset) {
+    var from = document.getElementById(fromId);
+    var to = document.getElementById(toId);
+
+    var selection = window.getSelection();
+    selection.setBaseAndExtent(from, fromOffset, to, toOffset);
+}
+
+function mouseClick(positionX, positionY) {
+    if (!window.testRunner)
+        return;
+
+    eventSender.mouseMoveTo(positionX, positionY);
+    eventSender.mouseDown();
+    eventSender.mouseUp();
+}