Mac App Launcher is positioned on center of dock in certain cases.

chrome/browser/ui/app_list/app_list_service_mac.mm

Index: chrome/browser/ui/app_list/app_list_service_mac.mm
diff --git a/chrome/browser/ui/app_list/app_list_service_mac.mm b/chrome/browser/ui/app_list/app_list_service_mac.mm
index 01130b30b4209c53af62cf2c8cd103a2a1156021..4ce33732a623902e52dca940100024b40ab727f7 100644
--- a/chrome/browser/ui/app_list/app_list_service_mac.mm
+++ b/chrome/browser/ui/app_list/app_list_service_mac.mm
@@ -75,6 +75,10 @@ namespace {
 // Version of the app list shortcut version installed.
 const int kShortcutVersion = 1;
 
+// If the mouse cursor is less than this distance, in pixels, away from the
+// dock, it is considered to be in the dock for the purpose of anchoring.
+const int kSnapDistance = 50;

[tapted, 2013/11/29 02:12:51]

I think this should be at least window width for a left/right dock, and at least
window height for a bottom dock. It really bugs me when I use the Windows app
launcher, and I know where I need to click when it appears, but because it took
too long, the window decided not to pop up there.

[tapted, 2013/11/29 06:05:59]

Did you see this?

[Matt Giuca, 2013/12/02 05:02:03]

Yes, I made a note to get to it on Monday.

Yes, I agree. Done.

+
 // Duration of show and hide animations.
 const NSTimeInterval kAnimationDuration = 0.2;
 
@@ -280,24 +284,24 @@ void AppListServiceMac::FindAnchorPoint(const gfx::Size& window_size,
                                         NSPoint* target_origin,
                                         NSPoint* start_origin) {
   AppListPositioner positioner(display, window_size, 0);
-  AppListPositioner::ScreenEdge dock_location =
-      AppListPositioner::SCREEN_EDGE_UNKNOWN;
+  AppListPositioner::ScreenEdge dock_location = DockLocationInDisplay(display);
+
   gfx::Point anchor;
-  if (!cursor_is_visible) {
+  // Snap to the dock edge. If the cursor is greater than kSnapDistance away or
+  // not visible, anchor to the center of the dock. Otherwise, anchor to the
+  // cursor position.
+  if (dock_location == AppListPositioner::SCREEN_EDGE_UNKNOWN) {
     anchor = positioner.GetAnchorPointForScreenCorner(
         AppListPositioner::SCREEN_CORNER_BOTTOM_LEFT);
   } else {
-    dock_location = DockLocationInDisplay(display);
-
-    // Snap to the dock edge, anchored to the cursor position.
-    if (dock_location == AppListPositioner::SCREEN_EDGE_UNKNOWN) {
-      anchor = positioner.GetAnchorPointForScreenCorner(
-          AppListPositioner::SCREEN_CORNER_BOTTOM_LEFT);
+    // Subtract the dock area since the display's default work_area will not
+    // subtract it if the dock is set to auto-hide, and the app list should
+    // never overlap the dock.
+    AdjustWorkAreaForDock(display, &positioner, dock_location);
+    if (!cursor_is_visible || positioner.GetCursorDistanceFromShelf(
+                                  dock_location, cursor) > kSnapDistance) {
+      anchor = positioner.GetAnchorPointForShelfCenter(dock_location);
     } else {
-      // Subtract the dock area since the display's default work_area will not
-      // subtract it if the dock is set to auto-hide, and the app list should
-      // never overlap the dock.
-      AdjustWorkAreaForDock(display, &positioner, dock_location);
       anchor = positioner.GetAnchorPointForShelfCursor(dock_location, cursor);
     }
   }