[Android] Allow custom ActionMode creation via ContentViewClient

android_webview/java/src/org/chromium/android_webview/AwContentsClient.java

 // Copyright 2012 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.
 
 package org.chromium.android_webview;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.Picture;
 import android.net.Uri;
 import android.net.http.SslError;
 import android.os.Looper;
 import android.os.Message;
 import android.view.KeyEvent;
 import android.view.View;
 import android.webkit.ConsoleMessage;
 import android.webkit.GeolocationPermissions;
 import android.webkit.ValueCallback;
 import android.webkit.WebChromeClient;
 
 import org.chromium.android_webview.permission.AwPermissionRequest;
 import org.chromium.base.annotations.SuppressFBWarnings;
+import org.chromium.content.browser.SelectActionMode;
+import org.chromium.content.browser.SelectActionModeCallback.ActionHandler;
 
 import java.security.Principal;
 import java.util.HashMap;
 
 /**
  * Base-class that an AwContents embedder derives from to receive callbacks.
  * This extends ContentViewClient, as in many cases we want to pass-thru ContentViewCore
  * callbacks right to our embedder, and this setup facilities that.
  * For any other callbacks we need to make transformations of (e.g. adapt parameters
  * or perform filtering) we can provide final overrides for methods here, and then introduce
@@ skipping 276 matching lines @@
     //
     public abstract void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches,
             boolean isDoneCounting);
 
     /**
      * Called whenever there is a new content picture available.
      * @param picture New picture.
      */
     public abstract void onNewPicture(Picture picture);
 
+    public abstract SelectActionMode startActionMode(
+            View view, ActionHandler actionHandler, boolean floating);
+
+    public abstract boolean supportsFloatingActionMode();
 }