[CSS Regions] Helper functions for selection layout tests

LayoutTests/fast/regions/resources/helper.js

 function isDebugEnabled()
 {
     // Add #debug at the end of the url to visually debug the test case.
     return window.location.hash == "#debug";
 }
 
 function getFlowByName(name)
 {
     var namedFlows = document.webkitGetNamedFlows();
     return namedFlows[name] ? namedFlows[name] : null;
@@ skipping 184 matching lines @@
         for (var i = 0; i < current.length; i++)
             if (current[i] !== expected[i]) {
                 testFailed("Expected ["  + expected.toString() + "]. Was [" + current.toString() + "]");
                 return;
             }
     } catch (ex) {
         testFailed(current + " threw exception " + ex);
     }
     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();
+}