[ios showcase] Integrated TextBadgeView with Showcase.

ios/showcase/text_badge_view/BUILD.gn

Index: ios/showcase/text_badge_view/BUILD.gn
diff --git a/ios/showcase/text_badge_view/BUILD.gn b/ios/showcase/text_badge_view/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..ab9a4f032cda1c8c3dd028b3874510fecf8df057
--- /dev/null
+++ b/ios/showcase/text_badge_view/BUILD.gn
@@ -0,0 +1,26 @@
+source_set("text_badge_view") {
+  sources = [
+    "sc_text_badge_view_controller.h",
+    "sc_text_badge_view_controller.mm",
+  ]
+  deps = [
+    "//ios/chrome/browser/ui/reading_list:reading_list_ui",
+  ]
+  libs = [ "UIKit.framework" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}
+
+source_set("eg_tests") {
+  testonly = true
+  sources = [
+    "sc_text_badge_view_egtest.mm",
+  ]
+  deps = [
+    "//ios/chrome/browser/ui/reading_list:reading_list_ui",
+    "//ios/chrome/test/earl_grey:test_support",
+    "//ios/showcase/test",
+    "//ios/third_party/earl_grey",
+    "//ui/base",
+  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}