[Android] Omnibox Placeholder Experiment

chrome/android/java_sources.gni

 # Copyright 2016 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.
 
 chrome_java_sources = [
   "java/src/com/google/android/apps/chrome/appwidget/bookmarks/BookmarkThumbnailWidgetProvider.java",
   "java/src/org/chromium/chrome/browser/ActivityTabTaskDescriptionHelper.java",
   "java/src/org/chromium/chrome/browser/ActivityTaskDescriptionIconGenerator.java",
   "java/src/org/chromium/chrome/browser/AfterStartupTaskUtils.java",
   "java/src/org/chromium/chrome/browser/AppIndexingUtil.java",
@@ skipping 709 matching lines @@
   "java/src/org/chromium/chrome/browser/omnibox/LocationBarPhone.java",
   "java/src/org/chromium/chrome/browser/omnibox/LocationBarTablet.java",
   "java/src/org/chromium/chrome/browser/omnibox/OmniboxPrerender.java",
   "java/src/org/chromium/chrome/browser/omnibox/OmniboxResultsAdapter.java",
   "java/src/org/chromium/chrome/browser/omnibox/OmniboxSuggestion.java",
   "java/src/org/chromium/chrome/browser/omnibox/OmniboxUrlEmphasizer.java",
   "java/src/org/chromium/chrome/browser/omnibox/OmniboxViewUtil.java",
   "java/src/org/chromium/chrome/browser/omnibox/SuggestionAnswer.java",
   "java/src/org/chromium/chrome/browser/omnibox/SuggestionView.java",
   "java/src/org/chromium/chrome/browser/omnibox/UrlBar.java",
+  "java/src/org/chromium/chrome/browser/omnibox/OmniboxPlaceholderFieldTrial.java",
   "java/src/org/chromium/chrome/browser/omnibox/UrlFocusChangeListener.java",
   "java/src/org/chromium/chrome/browser/omnibox/VoiceSuggestionProvider.java",
   "java/src/org/chromium/chrome/browser/omnibox/geo/GeolocationHeader.java",
   "java/src/org/chromium/chrome/browser/omnibox/geo/GeolocationSnackbarController.java",
   "java/src/org/chromium/chrome/browser/omnibox/geo/GeolocationTracker.java",
   "java/src/org/chromium/chrome/browser/omnibox/geo/PlatformNetworksManager.java",
   "java/src/org/chromium/chrome/browser/omnibox/geo/VisibleNetworks.java",
   "java/src/org/chromium/chrome/browser/omnibox/geo/VisibleNetworksTracker.java",
   "java/src/org/chromium/chrome/browser/page_info/CertificateChainHelper.java",
   "java/src/org/chromium/chrome/browser/page_info/CertificateViewer.java",
@@ skipping 1057 matching lines @@
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/SyncTestBase.java",
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/TypedUrlsTest.java",
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/ui/PassphraseTypeDialogFragmentTest.java",
 ]
 
 # Only used for testing, should not be shipped to end users.
 if (!is_official_build) {
   chrome_java_sources += [ "java/src/org/chromium/chrome/browser/offlinepages/evaluation/OfflinePageEvaluationBridge.java" ]
   chrome_test_java_sources += [ "javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageSavePageLaterEvaluationTest.java" ]
 }