Experimental alignment layout manager using a property on the views

ui/views/BUILD.gn

Index: ui/views/BUILD.gn
diff --git a/ui/views/BUILD.gn b/ui/views/BUILD.gn
index 565b115f02a7031c8b190266de5b01fca72f2d29..57f838825123ae6c9d2afb99a08dbe30d7e291f7 100644
--- a/ui/views/BUILD.gn
+++ b/ui/views/BUILD.gn
@@ -20,6 +20,8 @@ component("views") {
     "accessibility/native_view_accessibility_win.h",
     "accessible_pane_view.cc",
     "accessible_pane_view.h",
+    "anchor_attribute.cc",
+    "anchor_attribute.h",
     "animation/bounds_animator.cc",
     "animation/bounds_animator.h",
     "animation/flood_fill_ink_drop_ripple.cc",
@@ -48,6 +50,8 @@ component("views") {
     "animation/scroll_animator.h",
     "animation/square_ink_drop_ripple.cc",
     "animation/square_ink_drop_ripple.h",
+    "attributes.cc",
+    "attributes.h",
     "background.cc",
     "background.h",
     "border.cc",
@@ -257,6 +261,8 @@ component("views") {
     "event_monitor.h",
     "event_monitor_mac.h",
     "event_monitor_mac.mm",
+    "fill_attribute.cc",
+    "fill_attribute.h",
     "focus/external_focus_tracker.cc",
     "focus/external_focus_tracker.h",
     "focus/focus_manager.cc",
@@ -270,6 +276,8 @@ component("views") {
     "focus/view_storage.h",
     "focus/widget_focus_manager.cc",
     "focus/widget_focus_manager.h",
+    "layout/align_layout.cc",
+    "layout/align_layout.h",
     "layout/box_layout.cc",
     "layout/box_layout.h",
     "layout/fill_layout.cc",
@@ -807,6 +815,7 @@ source_set("views_unittests_sources") {
     "animation/ink_drop_ripple_unittest.cc",
     "animation/ink_drop_unittest.cc",
     "animation/square_ink_drop_ripple_unittest.cc",
+    "attributes_unittest.cc",
     "border_unittest.cc",
     "bubble/bubble_border_unittest.cc",
     "bubble/bubble_dialog_delegate_unittest.cc",
@@ -848,6 +857,8 @@ source_set("views_unittests_sources") {
     "event_monitor_unittest.cc",
     "focus/focus_manager_unittest.cc",
     "focus/focus_traversal_unittest.cc",
+    "layout/align_layout_unittest.cc",
+    "layout/anchor_layout_unittest.cc",
     "layout/box_layout_unittest.cc",
     "layout/grid_layout_unittest.cc",
     "rect_based_targeting_utils_unittest.cc",