Upstream dom_distiller iOS factories

ios/chrome/browser/dom_distiller/distiller_viewer.cc

+// Copyright 2015 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 "ios/chrome/browser/dom_distiller/distiller_viewer.h"
+
+#include <string>
+
+#include "components/dom_distiller/core/distilled_page_prefs.h"
+#include "components/dom_distiller/core/dom_distiller_service.h"
+#include "components/dom_distiller/core/proto/distilled_article.pb.h"
+#include "components/dom_distiller/core/task_tracker.h"
+#include "components/dom_distiller/core/viewer.h"
+#include "ios/chrome/browser/dom_distiller/dom_distiller_service_factory.h"
+#include "ios/public/provider/chrome/browser/browser_state/chrome_browser_state.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace dom_distiller {
+
+DistillerViewer::DistillerViewer(ios::ChromeBrowserState* browser_state,
+                                 const GURL& url,
+                                 const DistillationFinishedCallback& callback)
+    : url_(url),
+      callback_(callback),
+      distilled_page_prefs_(new DistilledPagePrefs(browser_state->GetPrefs())) {
+  DCHECK(browser_state);
+  DCHECK(url.is_valid());
+  dom_distiller::DomDistillerService* distillerService =
+      dom_distiller::DomDistillerServiceFactory::GetForBrowserState(
+          browser_state);
+
+  viewer_handle_ = distillerService->ViewUrl(
+      this, distillerService->CreateDefaultDistillerPage(gfx::Size()), url);
+}
+
+DistillerViewer::~DistillerViewer() {
+}
+
+void DistillerViewer::OnArticleReady(
+    const DistilledArticleProto* article_proto) {
+  const std::string html = viewer::GetUnsafeArticleHtml(
+      article_proto, distilled_page_prefs_->GetTheme(),
+      distilled_page_prefs_->GetFontFamily());
+
+  callback_.Run(url_, html);
+
+  // No need to hold on to the ViewerHandle now that distillation is complete.
+  viewer_handle_.reset();
+}
+
+}  // namespace dom_distiller