Introduce the image_decoder service

chrome/browser/android/download/ui/thumbnail_provider.h

 // Copyright 2016 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 CHROME_BROWSER_ANDROID_DOWNLOAD_UI_THUMBNAIL_PROVIDER_H_
 #define CHROME_BROWSER_ANDROID_DOWNLOAD_UI_THUMBNAIL_PROVIDER_H_
 
 #include <string>
 
 #include "base/android/jni_android.h"
+#include "base/memory/weak_ptr.h"
 #include "chrome/browser/image_decoder.h"
 
 // Kicks off asynchronous pipelines for creating thumbnails for local files.
 // The native-side ThumbnailProvider is owned by the Java-side and can be
 // safely destroyed while a request is being processed.
 class ThumbnailProvider {
  public:
   explicit ThumbnailProvider(const base::android::JavaParamRef<jobject>& jobj);
 
   // Destroys the ThumbnailProvider.  Any currently running ImageRequest will
@@ skipping 17 matching lines @@
  private:
   ~ThumbnailProvider();
 
   base::android::ScopedJavaGlobalRef<jobject> java_delegate_;
   base::WeakPtrFactory<ThumbnailProvider> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ThumbnailProvider);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_UI_THUMBNAIL_PROVIDER_H_