Align the base of the shelf's context menu to the top edge of the shelf.

chrome/browser/ui/window_sizer/window_sizer_ash_uitest.cc

Index: chrome/browser/ui/window_sizer/window_sizer_ash_uitest.cc
diff --git a/chrome/browser/ui/window_sizer/window_sizer_ash_uitest.cc b/chrome/browser/ui/window_sizer/window_sizer_ash_uitest.cc
index 5ef9154d57ab71a8e4fc47060c49b7855ff2fb78..698d067b70b3bb9ae66f5aac0c43704c96caa308 100644
--- a/chrome/browser/ui/window_sizer/window_sizer_ash_uitest.cc
+++ b/chrome/browser/ui/window_sizer/window_sizer_ash_uitest.cc
@@ -163,7 +163,7 @@ void OpenBrowserUsingContextMenuOnRootWindow(aura::Window* root_window) {
   gfx::Point chrome_icon =
       GetChromeIconBoundsForRootWindow(root_window).CenterPoint();
   gfx::Point release_point = chrome_icon;
-  release_point.Offset(50, -120);
+  release_point.Offset(50, -153);

[dschuyler, 2017/05/08 20:46:58]

Consider a comment about the constants 50 and -153. (e.g. // 50 is the distance
to ______; -153 moves _____ to _____.)
or expressing them as constexpr's with descriptive names (e.g. 
constexpr int kDistanceTo_____ = 50;
constexpr int k______Delta = -513;
).

   ui_controls::SendMouseMoveNotifyWhenDone(
       chrome_icon.x(), chrome_icon.y(),
       base::Bind(&WindowSizerContextMenuTest::Step1, release_point));