Make the ENABLE_APP_LIST build flag work on Linux

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 c6e1a56a81e391c44afa2fdd161539272fe8623e..d5bdc6180aeae598d0a55a3b0dd8145288b9c771 100644
--- a/chrome/browser/ui/BUILD.gn
+++ b/chrome/browser/ui/BUILD.gn
@@ -235,6 +235,12 @@ source_set("ui") {
                            "//chrome")
     deps += [ "//components/constrained_window" ]
 
+    if (enable_app_list) {
+      sources += rebase_path(
+          gypi_values.chrome_browser_ui_views_app_list_sources,
+          ".",
+          "//chrome")
+    }
     if (enable_extensions) {
       deps += [ "//extensions/components/native_app_window" ]
     }
@@ -424,6 +430,12 @@ source_set("ui") {
     sources += rebase_path(gypi_values.chrome_browser_ui_desktop_linux_sources,
                            ".",
                            "//chrome")
+    if (enable_app_list) {
+      sources += rebase_path(
+          gypi_values.chrome_browser_ui_desktop_linux_app_list_sources,
+          ".",
+          "//chrome")
+    }
     deps += [
       "//ui/base/ime",
       "//ui/events:dom_keycode_converter",