Support error handling for Surface readbacks

content/browser/android/content_view_core_impl.cc

 // Copyright 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.
 
 #include "content/browser/android/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 615 matching lines @@
     return;
   Java_ContentViewCore_showPastePopupWithFeedback(env, obj.obj(),
                                                   static_cast<jint>(x_dip),
                                                   static_cast<jint>(y_dip));
 }
 
 void ContentViewCoreImpl::GetScaledContentBitmap(
     float scale,
     SkColorType color_type,
     gfx::Rect src_subrect,
-    const base::Callback<void(bool, const SkBitmap&)>& result_callback) {
+    ReadbackRequestCallback& result_callback) {
   RenderWidgetHostViewAndroid* view = GetRenderWidgetHostViewAndroid();
   if (!view) {
-    result_callback.Run(false, SkBitmap());
+    result_callback.Run(SkBitmap(), READBACK_FAILED);
     return;
   }
 
   view->GetScaledContentBitmap(scale, color_type, src_subrect,
       result_callback);
 }
 
 void ContentViewCoreImpl::StartContentIntent(const GURL& content_url) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> j_obj = java_ref_.get(env);
@@ skipping 675 matching lines @@
       reinterpret_cast<ui::WindowAndroid*>(window_android),
       retained_objects_set);
   return reinterpret_cast<intptr_t>(view);
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content