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

chrome/browser/ui/app_list/app_list_positioner_unittest.cc

Index: chrome/browser/ui/app_list/app_list_positioner_unittest.cc
diff --git a/chrome/browser/ui/app_list/app_list_positioner_unittest.cc b/chrome/browser/ui/app_list/app_list_positioner_unittest.cc
index f002f48507ac34c8beb042ab2629e9946fb1736d..64fc157882eb511a22dda006e6ba3a7181f700c6 100644
--- a/chrome/browser/ui/app_list/app_list_positioner_unittest.cc
+++ b/chrome/browser/ui/app_list/app_list_positioner_unittest.cc
@@ -88,6 +88,11 @@ class AppListPositionerUnitTest : public testing::Test {
     return positioner_->GetAnchorPointForShelfCorner(shelf_edge);
   }
 
+  gfx::Point DoGetAnchorPointForShelfCenter(
+      AppListPositioner::ScreenEdge shelf_edge) const {
+    return positioner_->GetAnchorPointForShelfCenter(shelf_edge);
+  }
+
   gfx::Point DoGetAnchorPointForShelfCursor(
       AppListPositioner::ScreenEdge shelf_edge) const {
     return positioner_->GetAnchorPointForShelfCursor(shelf_edge, cursor_);
@@ -170,6 +175,33 @@ TEST_F(AppListPositionerUnitTest, ShelfCorner) {
       DoGetAnchorPointForShelfCorner(AppListPositioner::SCREEN_EDGE_BOTTOM));
 }
 
+TEST_F(AppListPositionerUnitTest, ShelfCenter) {
+  // Position the app list on the shelf, aligned with the shelf center.
+  PlaceShelf(AppListPositioner::SCREEN_EDGE_LEFT);
+  // Shelf on left. Expect app list to be center-left.
+  EXPECT_EQ(
+      gfx::Point(83, kScreenHeight / 2),
+      DoGetAnchorPointForShelfCenter(AppListPositioner::SCREEN_EDGE_LEFT));
+
+  // Shelf on right. Expect app list to be center-right.
+  PlaceShelf(AppListPositioner::SCREEN_EDGE_RIGHT);
+  EXPECT_EQ(
+      gfx::Point(kScreenWidth - 83, kScreenHeight / 2),
+      DoGetAnchorPointForShelfCenter(AppListPositioner::SCREEN_EDGE_RIGHT));
+
+  // Shelf on top. Expect app list to be top-center.
+  PlaceShelf(AppListPositioner::SCREEN_EDGE_TOP);
+  EXPECT_EQ(
+      gfx::Point(kScreenWidth / 2, 133),
+      DoGetAnchorPointForShelfCenter(AppListPositioner::SCREEN_EDGE_TOP));
+
+  // Shelf on bottom. Expect app list to be bottom-center.
+  PlaceShelf(AppListPositioner::SCREEN_EDGE_BOTTOM);
+  EXPECT_EQ(
+      gfx::Point(kScreenWidth / 2, kScreenHeight - 133),
+      DoGetAnchorPointForShelfCenter(AppListPositioner::SCREEN_EDGE_BOTTOM));
+}
+
 TEST_F(AppListPositionerUnitTest, ShelfCursor) {
   // Position the app list on the shelf, aligned with the mouse cursor.