aw: Add versions to public function tables

android_webview/public/browser/draw_sw.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_PUBLIC_BROWSER_DRAW_SW_H_
 #define ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_SW_H_
 
 #include <jni.h>
 #include <stddef.h>
 
@@ skipping 25 matching lines @@
 
 // Called to create an Android Picture object encapsulating a native SkPicture.
 typedef jobject (AwCreatePictureFunction)(JNIEnv* env, SkPicture* picture);
 
 // Method that returns the current Skia function.
 typedef void (SkiaVersionFunction)(int* major, int* minor, int* patch);
 
 // Called to verify if the Skia versions are compatible.
 typedef bool (AwIsSkiaVersionCompatibleFunction)(SkiaVersionFunction function);
 
+static const int kAwDrawSWFunctionTableVersion = 1;
+
 // "vtable" for the functions declared in this file. An instance must be set via
 // AwContents.setAwDrawSWFunctionTable
 struct AwDrawSWFunctionTable {
+  int version;
   AwAccessPixelsFunction* access_pixels;
   AwReleasePixelsFunction* release_pixels;
 };
 
 #endif  // ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_SW_H_