android: add ThumbnailCache

content/browser/android/content_readback_handler.cc

 // Copyright 2014 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.
 
 #include "content/browser/android/content_readback_handler.h"
 
 #include "base/android/jni_android.h"
 #include "base/bind.h"
 #include "content/browser/android/content_view_core_impl.h"
 #include "jni/ContentReadbackHandler_jni.h"
@@ skipping 43 matching lines @@
                                               jobject content_view_core) {
   ContentViewCore* view =
       ContentViewCore::GetNativeContentViewCore(env, content_view_core);
   DCHECK(view);
 
   base::Callback<void(bool, const SkBitmap&)> result_callback =
       base::Bind(&ContentReadbackHandler::OnFinishContentReadback,
                  weak_factory_.GetWeakPtr(),
                  readback_id);
 
+  SkBitmap::Config skbitmap_format = gfx::ConvertToSkiaConfig(config);
   view->GetScaledContentBitmap(
-      scale, config, gfx::Rect(x, y, width, height), result_callback);
-  return;
+      scale, skbitmap_format, gfx::Rect(x, y, width, height), result_callback);
 }
 
 // static
 static jlong Init(JNIEnv* env, jobject obj) {
   ContentReadbackHandler* content_readback_handler =
       new ContentReadbackHandler(env, obj);
   return reinterpret_cast<intptr_t>(content_readback_handler);
 }
 
 }  // namespace content