MacViews: Implement Tab Dragging

chrome/test/base/interactive_test_utils.h

Index: chrome/test/base/interactive_test_utils.h
diff --git a/chrome/test/base/interactive_test_utils.h b/chrome/test/base/interactive_test_utils.h
index f0ccc770f2a8cfae8ca6437cdfc83364527badf7..93ede615b3b86caa238cb300d3bdf7e8816fa119 100644
--- a/chrome/test/base/interactive_test_utils.h
+++ b/chrome/test/base/interactive_test_utils.h
@@ -21,6 +21,16 @@ class View;
 
 namespace ui_test_utils {
 
+#if defined(OS_MACOSX)
+// Moves the mouse to the |from| position, presses left mouse button,
+// then moves mouse to the |to| position and releases left mouse button.
+// |steps| indicates number of intermediate points that are interpolated between
+// |from| and |to|.
+void DragAndDrop(const gfx::Point& from,
+                 const gfx::Point& to,
+                 int steps = 1);
+#endif  // OS_MACOSX
+
 // Brings the native window for |browser| to the foreground. Returns true on
 // success.
 bool BringBrowserWindowToFront(const Browser* browser) WARN_UNUSED_RESULT;