[Android WebView] Implement the capture picture API.

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

 // Copyright (c) 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.graphics.Picture;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
 import android.util.Log;
 import android.view.KeyEvent;
 import android.webkit.ConsoleMessage;
 import android.webkit.GeolocationPermissions;
 
@@ skipping 225 matching lines @@
     protected abstract void onRequestFocus();
 
     //--------------------------------------------------------------------------------------------
     //                              Other WebView-specific methods
     //--------------------------------------------------------------------------------------------
     //
 
     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 void onPageStarted(String url);
 
     public abstract void onPageFinished(String url);
 
     public abstract void onReceivedError(int errorCode, String description, String failingUrl);
 
     //--------------------------------------------------------------------------------------------
     //             Stuff that we ignore since it only makes sense for Chrome browser
     //--------------------------------------------------------------------------------------------
     //
 
     @Override
     final public boolean shouldOverrideScroll(float dx, float dy, float scrollX, float scrollY) {
         return false;
     }
 
     @Override
     final public void onContextualActionBarShown() {
     }
 
     @Override
     final public void onContextualActionBarHidden() {
     }
 }