[ios] BubbleViewController and BubbleView stubs.

ios/chrome/browser/ui/bubble_promo/BUILD.gn

Index: ios/chrome/browser/ui/bubble_promo/BUILD.gn
diff --git a/ios/chrome/browser/ui/bubble_promo/BUILD.gn b/ios/chrome/browser/ui/bubble_promo/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..5278b9661473f6bc266db52bc50c5cd0d0971cdd
--- /dev/null
+++ b/ios/chrome/browser/ui/bubble_promo/BUILD.gn
@@ -0,0 +1,30 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("bubble_promo") {
+  configs += [ "//build/config/compiler:enable_arc" ]
+  sources = [
+    "bubble_view.h",
+    "bubble_view.mm",
+    "bubble_view_controller.h",
+    "bubble_view_controller.mm",
+  ]
+  deps = [
+    "//base",
+  ]
+  libs = [ "UIKit.framework" ]
+}
+
+source_set("unit_tests") {

[gchatz, 2017/07/07 04:29:10]

This target is never depended on. So need to add it to a unit test target in
ios/chrome/browser/ui/BUILD.gn.

[helenlyang, 2017/07/07 23:29:15]

Done. I added it to ios_chrome_unittests in ios/chrome/test/BUILD.gn.

+  configs += [ "//build/config/compiler:enable_arc" ]
+  testonly = true
+  sources = [
+    "bubble_view_controller_unittest.mm",
+  ]
+  deps = [
+    ":bubble_promo",
+    "//base",
+    "//testing/gtest",
+  ]
+}