Let embedder provide select action mode

android_webview/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/config/locales.gni")
 import("//tools/grit/repack.gni")
 import("//tools/resources/generate_resource_whitelist.gni")
 import("system_webview_apk_tmpl.gni")
@@ skipping 523 matching lines @@
       "//components/spellcheck/renderer",
     ]
   }
 
   configs += [ "//v8:external_startup_data" ]
 }
 
 android_library("android_webview_java") {
   java_files = [
     "java/src/org/chromium/android_webview/AndroidProtocolHandler.java",
+    "java/src/org/chromium/android_webview/AwActionModeCallback.java",
     "java/src/org/chromium/android_webview/AwAutofillClient.java",
     "java/src/org/chromium/android_webview/AwBrowserContext.java",
     "java/src/org/chromium/android_webview/AwBrowserProcess.java",
     "java/src/org/chromium/android_webview/AwContentVideoViewEmbedder.java",
     "java/src/org/chromium/android_webview/AwContentViewClient.java",
     "java/src/org/chromium/android_webview/AwContents.java",
     "java/src/org/chromium/android_webview/AwContentsBackgroundThreadClient.java",
     "java/src/org/chromium/android_webview/AwContentsClient.java",
     "java/src/org/chromium/android_webview/AwContentsClientBridge.java",
     "java/src/org/chromium/android_webview/AwContentsClientCallbackHelper.java",
@@ skipping 131 matching lines @@
   system_webview_apk_tmpl("system_webview_apk") {
     android_manifest = system_webview_android_manifest
     android_manifest_dep = ":system_webview_manifest"
     deps = [
       ":system_webview_resources",
       "//android_webview/glue",
     ]
     apk_name = "SystemWebView"
   }
 }