Cache auxiliary bitmap across draw frames

android_webview/native/java_browser_view_renderer_helper.h

 // Copyright (c) 2013 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_JAVA_BROWSER_VIEW_RENDERER_HELPER_H_
 #define ANDROID_WEBVIEW_NATIVE_JAVA_BROWSER_VIEW_RENDERER_HELPER_H_
 
 #include "android_webview/browser/browser_view_renderer.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/compiler_specific.h"
 
 namespace android_webview {
 
 // Native side of java-class of same name.
 // Provides utility methods for rendering involving with Java objects.
 class JavaBrowserViewRendererHelper : public BrowserViewRenderer::JavaHelper {
  public:
   JavaBrowserViewRendererHelper();
   virtual ~JavaBrowserViewRendererHelper();
 
   // BrowserViewRenderer::JavaHelper implementation.
   virtual base::android::ScopedJavaLocalRef<jobject> CreateBitmap(
       JNIEnv* env,
       int width,
-      int height) OVERRIDE;
+      int height,
+      bool cache_result) OVERRIDE;
   virtual void DrawBitmapIntoCanvas(
       JNIEnv* env,
       const base::android::JavaRef<jobject>& jbitmap,
       const base::android::JavaRef<jobject>& jcanvas) OVERRIDE;
   virtual base::android::ScopedJavaLocalRef<jobject> RecordBitmapIntoPicture(
      JNIEnv* env,
      const base::android::JavaRef<jobject>& jbitmap) OVERRIDE;
 };
 
 bool RegisterJavaBrowserViewRendererHelper(JNIEnv* env);
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_NATIVE_JAVA_BROWSER_VIEW_RENDERER_HELPER_H_