Refactor WindowFinder definition

chrome/browser/ui/BUILD.gn

Index: chrome/browser/ui/BUILD.gn
diff --git a/chrome/browser/ui/BUILD.gn b/chrome/browser/ui/BUILD.gn
index 31313c356132a6f884cdaa11bf93bd2347e1f31a..0ca883fa5b0b61f5e293753edd78808d23552c49 100644
--- a/chrome/browser/ui/BUILD.gn
+++ b/chrome/browser/ui/BUILD.gn
@@ -1803,10 +1803,6 @@ split_static_library("ui") {
         "views/tabs/tab_strip_controller.h",
         "views/tabs/tab_strip_layout.cc",
         "views/tabs/tab_strip_layout.h",
-        "views/tabs/window_finder.cc",
-        "views/tabs/window_finder.h",
-        "views/tabs/window_finder_chromeos.cc",
-        "views/tabs/window_finder_win.cc",
         "views/theme_copying_widget.cc",
         "views/theme_copying_widget.h",
         "views/toolbar/app_menu.cc",
@@ -1852,17 +1848,6 @@ split_static_library("ui") {
           "//services/ui/public/interfaces",
         ]
       }
-
-      # TODO(ellyjones): Mus is not supported on Mac (there is no ui::Window
-      # apart from aura::Window, which is also not supported).
-      if (!is_mac) {
-        sources += [
-          "views/tabs/window_finder_mus.cc",
-          "views/tabs/window_finder_mus.h",
-        ]
-
-        deps += [ "//ui/views/mus" ]
-      }
     }
     if (use_ash) {
       sources += [
@@ -1880,7 +1865,6 @@ split_static_library("ui") {
         "views/frame/immersive_mode_controller_ash.h",
         "views/frame/web_app_left_header_view_ash.cc",
         "views/frame/web_app_left_header_view_ash.h",
-        "views/tabs/window_finder_ash.cc",
       ]
     }
   }
@@ -2351,7 +2335,6 @@ split_static_library("ui") {
         "views/frame/browser_non_client_frame_view_mac.mm",
         "views/frame/native_browser_frame_factory_mac.mm",
         "views/infobars/legacy_infobars_mac.cc",
-        "views/tabs/window_finder_mac.mm",
       ]
       deps += [ "//extensions/components/native_app_window" ]
     } else {
@@ -3045,19 +3028,53 @@ split_static_library("ui") {
       sources += [
         "views/javascript_app_modal_event_blocker_x11.cc",
         "views/javascript_app_modal_event_blocker_x11.h",
-        "views/tabs/window_finder_x11.cc",
       ]
       configs += [ "//build/config/linux:x11" ]
       deps += [
         "//ui/events/devices",
         "//ui/events/devices/x11",
       ]
-      if (is_chromeos) {
-        sources -= [ "views/tabs/window_finder_x11.cc" ]
-      }
     }
   }
 
+  # Group window_finder* pick up logic as following:
+  # - Mus is not support on Mac, so it builds only window_finder.h and
+  #   window_finder_mac.mm.
+  # - Other platforms (except Android) build window_finder.h/cc as well
+  #   as a platform specific associated file, e.g. window_finder_{win,chromeso}.
+  if (toolkit_views) {
+    if (!is_mac) {
+      sources += [
+        "views/tabs/window_finder.cc",
+        "views/tabs/window_finder.h",
+
+        # TODO(ellyjones): Mus is not supported on Mac (there is no ui::Window
+        # apart from aura::Window, which is also not supported).
+        "views/tabs/window_finder_mus.cc",
+        "views/tabs/window_finder_mus.h",
+      ]
+      deps += [ "//ui/views/mus" ]
+    }
+    if (is_chromeos) {
+      sources += [ "views/tabs/window_finder_chromeos.cc" ]
+    }
+    if (is_win) {
+      sources += [ "views/tabs/window_finder_win.cc" ]
+    }
+    if (is_desktop_linux && use_x11) {
+      sources += [ "views/tabs/window_finder_x11.cc" ]
+    }
+    if (use_ash) {
+      sources += [ "views/tabs/window_finder_ash.cc" ]
+    }
+  }
+  if (is_mac && mac_views_browser) {
+    sources += [
+      "views/tabs/window_finder.h",
+      "views/tabs/window_finder_mac.mm",
+    ]
+  }
+
   if (use_udev) {
     deps += [ "//device/udev_linux" ]
   }