Add an experimental search widget

chrome/android/java_sources.gni

Index: chrome/android/java_sources.gni
diff --git a/chrome/android/java_sources.gni b/chrome/android/java_sources.gni
index f64a5c434f68fbecb0f94258163650f10712426a..811881d8a6d9200489555435073520af837647a5 100644
--- a/chrome/android/java_sources.gni
+++ b/chrome/android/java_sources.gni
@@ -900,6 +900,11 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/rappor/RapporServiceBridge.java",
   "java/src/org/chromium/chrome/browser/rlz/RevenueStats.java",
   "java/src/org/chromium/chrome/browser/search_engines/TemplateUrlService.java",
+  "java/src/org/chromium/chrome/browser/searchwidget/BoxAnimatorScrim.java",
+  "java/src/org/chromium/chrome/browser/searchwidget/SearchActivity.java",
+  "java/src/org/chromium/chrome/browser/searchwidget/SearchBoxDataProvider.java",
+  "java/src/org/chromium/chrome/browser/searchwidget/SearchLocationBarLayout.java",
+  "java/src/org/chromium/chrome/browser/searchwidget/SearchWidgetProvider.java",
   "java/src/org/chromium/chrome/browser/services/AccountsChangedReceiver.java",
   "java/src/org/chromium/chrome/browser/services/AndroidEduAndChildAccountHelper.java",
   "java/src/org/chromium/chrome/browser/services/AndroidEduOwnerCheckCallback.java",