[WebView] Add a new flushVisualState API to AwContents.

android_webview/native/aw_contents.h

 // 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.
 
 #ifndef ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_H_
 #define ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_H_
 
 #include <jni.h>
 #include <list>
 #include <string>
@@ skipping 109 matching lines @@
               jboolean is_hardware_accelerated,
               jint scroll_x,
               jint scroll_y,
               jint visible_left,
               jint visible_top,
               jint visible_right,
               jint visible_bottom);
   jlong GetAwDrawGLViewContext(JNIEnv* env, jobject obj);
   jlong CapturePicture(JNIEnv* env, jobject obj, int width, int height);
   void EnableOnNewPicture(JNIEnv* env, jobject obj, jboolean enabled);
+  void FlushVisualState(JNIEnv* env, jobject obj, jobject callback);
   void ClearView(JNIEnv* env, jobject obj);
   void SetExtraHeadersForUrl(JNIEnv* env, jobject obj,
                              jstring url, jstring extra_headers);
 
   void InvokeGeolocationCallback(JNIEnv* env,
                                  jobject obj,
                                  jboolean value,
                                  jstring origin);
 
   // PermissionRequestHandlerClient implementation.
@@ skipping 115 matching lines @@
   GLViewRendererManager::Key renderer_manager_key_;
 
   DISALLOW_COPY_AND_ASSIGN(AwContents);
 };
 
 bool RegisterAwContents(JNIEnv* env);
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_H_