[Suggestions] Move ImageManager to the component

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 "content/public/browser/browser_thread.h"
+#include "net/base/load_flags.h"
+#include "net/url_request/url_request_context_getter.h"
+
+namespace suggestions {
+
+ImageFetcherImpl::ImageFetcherImpl(
+    net::URLRequestContextGetter* url_request_context)
+    : url_request_context_(url_request_context) {}
+
+ImageFetcherImpl::~ImageFetcherImpl() {}
+
+ImageFetcherImpl::ImageRequest::ImageRequest() : fetcher(NULL) {}
+
+ImageFetcherImpl::ImageRequest::ImageRequest(chrome::BitmapFetcher* f)
+    : fetcher(f) {}
+
+ImageFetcherImpl::ImageRequest::~ImageRequest() { delete fetcher; }
+
+void ImageFetcherImpl::SetImageFetcherDelegate(ImageFetcherDelegate* delegate) {
+  DCHECK(delegate);
+  delegate_ = delegate;
+}
+
+void ImageFetcherImpl::StartOrQueueNetworkRequest(
+    const GURL& url, const GURL& image_url,
+    base::Callback<void(const GURL&, const SkBitmap*)> 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()) {
+    // |image_url| is not being fetched, so create a request and initiate
+    // the fetch.
+    ImageRequest request(new chrome::BitmapFetcher(image_url, this));
+    request.url = url;
+    request.callbacks.push_back(callback);
+    request.fetcher->Start(
+        url_request_context_, std::string(),
+        net::URLRequest::CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE,
+        net::LOAD_NORMAL);
+    pending_net_requests_[image_url].swap(&request);
+  } else {
+    // Request in progress. Register as an interested callback.
+    it->second.callbacks.push_back(callback);
+  }
+}
+
+void ImageFetcherImpl::OnFetchComplete(const GURL image_url,
+                                       const SkBitmap* bitmap) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+  ImageRequestMap::iterator image_iter = pending_net_requests_.find(image_url);
+  DCHECK(image_iter != pending_net_requests_.end());
+
+  ImageRequest* request = &image_iter->second;
+
+  // Here |bitmap| could be NULL or a pointer to a bitmap which is owned by the
+  // BitmapFetcher and which ceases to exist after this function. Pass the
+  // un-owned pointer to the registered callbacks.
+  for (CallbackVector::iterator callback_iter = request->callbacks.begin();
+       callback_iter != request->callbacks.end(); ++callback_iter) {
+    callback_iter->Run(request->url, bitmap);
+  }
+
+  // Inform the ImageFetcherDelegate.
+  if (delegate_) {
+    delegate_->OnImageFetched(request->url, bitmap);
+  }
+
+  // Erase the completed ImageRequest.
+  pending_net_requests_.erase(image_iter);
+}
+
+}  // namespace suggestions