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 86b9cd0144118c786f94b12f937256aa81711f8d..48e129d5f01a95100c4a2a620718e75cbd106399 100644
--- a/chrome/browser/ui/app_list/app_list_positioner_unittest.cc
+++ b/chrome/browser/ui/app_list/app_list_positioner_unittest.cc
@@ -93,6 +93,11 @@ 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_);
@@ -176,6 +181,39 @@ 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(kShelfSize + kWindowWidth / 2 + kMinDistanceFromEdge,
+                 (kMenuBarSize + 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 - kShelfSize - kWindowWidth / 2 - kMinDistanceFromEdge,
+          (kMenuBarSize + 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,
+                       kMenuBarSize + kShelfSize + kWindowHeight / 2 +
+                           kMinDistanceFromEdge),
+            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 - kShelfSize - kWindowHeight / 2 -
+                     kMinDistanceFromEdge),
+      DoGetAnchorPointForShelfCenter(AppListPositioner::SCREEN_EDGE_BOTTOM));
+}
+
 TEST_F(AppListPositionerUnitTest, ShelfCursor) {
   // Position the app list on the shelf, aligned with the mouse cursor.