Pass the ImageDecoder to the ImageFetcher at creation time.

chrome/browser/search/suggestions/image_fetcher_impl.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 "chrome/browser/search/suggestions/image_fetcher_impl.h"
-
-#include <string>
-
-#include "base/bind.h"
-#include "chrome/browser/search/suggestions/image_decoder_impl.h"
-#include "content/public/browser/browser_thread.h"
-#include "net/base/load_flags.h"
-#include "net/url_request/url_request_context_getter.h"
-#include "ui/gfx/image/image.h"
-
-namespace suggestions {
-
-ImageFetcherImpl::ImageFetcherImpl(
-    net::URLRequestContextGetter* url_request_context)
-    : delegate_(nullptr), url_request_context_(url_request_context),
-      image_decoder_(new suggestions::ImageDecoderImpl()),
-      image_data_fetcher_(
-          new image_fetcher::ImageDataFetcher(url_request_context_)) {
-}
-
-ImageFetcherImpl::~ImageFetcherImpl() {}
-
-ImageFetcherImpl::ImageRequest::ImageRequest() {}
-
-ImageFetcherImpl::ImageRequest::ImageRequest(const ImageRequest& other) =
-    default;
-
-ImageFetcherImpl::ImageRequest::~ImageRequest() { }
-
-void ImageFetcherImpl::SetImageFetcherDelegate(
-    image_fetcher::ImageFetcherDelegate* delegate) {
-  DCHECK(delegate);
-  delegate_ = delegate;
-}
-
-void ImageFetcherImpl::StartOrQueueNetworkRequest(
-    const std::string& id,
-    const GURL& image_url,
-    base::Callback<void(const std::string&, const gfx::Image&)> callback) {
-  // Before starting to fetch the image. Look for a request in progress for
-  // |image_url|, and queue if appropriate.
-  ImageRequestMap::iterator it = pending_net_requests_.find(image_url);
-  if (it == pending_net_requests_.end()) {
-    ImageRequest request;
-    request.id = id;
-    request.callbacks.push_back(callback);
-    pending_net_requests_[image_url].swap(&request);
-
-    image_data_fetcher_->FetchImageData(
-        image_url,
-        base::Bind(&ImageFetcherImpl::OnImageURLFetched,
-                   base::Unretained(this), image_url));
-  } else {
-    // Request in progress. Register as an interested callback.
-    it->second.callbacks.push_back(callback);
-  }
-}
-
-void ImageFetcherImpl::OnImageURLFetched(const GURL& image_url,
-                                         const std::string& image_data) {
-  // Inform the ImageFetcherDelegate.
-  if (delegate_) {
-    auto it = pending_net_requests_.find(image_url);
-    DCHECK(it != pending_net_requests_.end());
-    delegate_->OnImageDataFetched(it->second.id, image_data);
-  }
-
-  image_decoder_->DecodeImage(
-      image_data,
-      base::Bind(&ImageFetcherImpl::OnImageDecoded,
-                 base::Unretained(this), image_url));
-}
-
-void ImageFetcherImpl::OnImageDecoded(const GURL& image_url,
-                                      const gfx::Image& image) {
-  // Get request for the given image_url from the request queue.
-  ImageRequestMap::iterator image_iter = pending_net_requests_.find(image_url);
-  DCHECK(image_iter != pending_net_requests_.end());
-  ImageRequest* request = &image_iter->second;
-
-  // Run all callbacks
-  for (const auto& callback : request->callbacks) {
-    callback.Run(request->id, image);
-  }
-
-  // Inform the ImageFetcherDelegate.
-  if (delegate_) {
-    delegate_->OnImageFetched(request->id, image);
-  }
-
-  // Erase the completed ImageRequest.
-  pending_net_requests_.erase(image_iter);
-}
-
-}  // namespace suggestions