Adding support for diagonal scrolling to telemetry.

tools/telemetry/telemetry/page/actions/scroll_unittest.py

Index: tools/telemetry/telemetry/page/actions/scroll_unittest.py
diff --git a/tools/telemetry/telemetry/page/actions/scroll_unittest.py b/tools/telemetry/telemetry/page/actions/scroll_unittest.py
index 23dd12083721bf54b55158a521e3e0ec162674d6..e9913aeee730acfd802b2ca429b486000806960f 100644
--- a/tools/telemetry/telemetry/page/actions/scroll_unittest.py
+++ b/tools/telemetry/telemetry/page/actions/scroll_unittest.py
@@ -41,6 +41,45 @@ class ScrollActionTest(tab_test_case.TabTestCase):
     self.assertTrue(scroll_position != 0,
                     msg='scroll_position=%d;' % (scroll_position))
 
+  def testDiagonalScrollAction(self):
+    self.Navigate('blank.html')
+
+    # Make page bigger than window so it's scrollable.
+    self._tab.ExecuteJavaScript("""document.body.style.height =
+                              (2 * window.innerHeight + 1) + 'px';""")
+    self._tab.ExecuteJavaScript("""document.body.style.width =
+                              (2 * window.innerWidth + 1) + 'px';""")
+
+    self.assertEquals(
+        self._tab.EvaluateJavaScript("""document.documentElement.scrollTop
+                                   || document.body.scrollTop"""), 0)
+    self.assertEquals(
+        self._tab.EvaluateJavaScript("""document.documentElement.scrollLeft
+                                   || document.body.scrollLeft"""), 0)
+
+    i = scroll.ScrollAction(direction='downright')
+    i.WillRunAction(self._tab)
+
+    self._tab.ExecuteJavaScript("""
+        window.__scrollAction.beginMeasuringHook = function() {
+            window.__didBeginMeasuring = true;
+        };
+        window.__scrollAction.endMeasuringHook = function() {
+            window.__didEndMeasuring = true;
+        };""")
+    i.RunAction(self._tab)
+
+    self.assertTrue(self._tab.EvaluateJavaScript('window.__didBeginMeasuring'))
+    self.assertTrue(self._tab.EvaluateJavaScript('window.__didEndMeasuring'))

[nednguyen, 2015/03/06 19:07:51]

Why do we need this?

+
+    viewport_top = self._tab.EvaluateJavaScript(
+        '(document.documentElement.scrollTop || document.body.scrollTop)')
+    self.assertTrue(viewport_top != 0, msg='viewport_top=%d;' % viewport_top)
+
+    viewport_left = self._tab.EvaluateJavaScript(
+        '(document.documentElement.scrollLeft || document.body.scrollLeft)')
+    self.assertTrue(viewport_left != 0, msg='viewport_left=%d;' % viewport_left)
+
   def testBoundingClientRect(self):
     self.Navigate('blank.html')