Revert 272611 "Add support for distilling current WebContents"

trunk/src/chrome/browser/dom_distiller/tab_utils.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/dom_distiller/tab_utils.h"
-
-#include "base/message_loop/message_loop.h"
-#include "chrome/browser/dom_distiller/dom_distiller_service_factory.h"
-#include "chrome/browser/ui/tab_contents/core_tab_helper.h"
-#include "chrome/browser/ui/tab_contents/core_tab_helper_delegate.h"
-#include "chrome/common/url_constants.h"
-#include "components/dom_distiller/content/distiller_page_web_contents.h"
-#include "components/dom_distiller/core/distiller_page.h"
-#include "components/dom_distiller/core/dom_distiller_service.h"
-#include "components/dom_distiller/core/task_tracker.h"
-#include "components/dom_distiller/core/url_utils.h"
-#include "content/public/browser/browser_context.h"
-#include "content/public/browser/navigation_controller.h"
-#include "content/public/browser/web_contents.h"
-#include "content/public/browser/web_contents_observer.h"
-
-namespace {
-
-using dom_distiller::ViewRequestDelegate;
-using dom_distiller::DistilledArticleProto;
-using dom_distiller::ArticleDistillationUpdate;
-using dom_distiller::ViewerHandle;
-using dom_distiller::SourcePageHandleWebContents;
-using dom_distiller::DomDistillerService;
-using dom_distiller::DomDistillerServiceFactory;
-using dom_distiller::DistillerPage;
-using dom_distiller::SourcePageHandle;
-
-// An no-op ViewRequestDelegate which holds a ViewerHandle and deletes itself
-// after the WebContents navigates or goes away. This class is a band-aid to
-// keep a TaskTracker around until the distillation starts from the viewer.
-class SelfDeletingRequestDelegate : public ViewRequestDelegate,
-                                    public content::WebContentsObserver {
- public:
-  explicit SelfDeletingRequestDelegate(content::WebContents* web_contents);
-  virtual ~SelfDeletingRequestDelegate();
-
-  // ViewRequestDelegate implementation.
-  virtual void OnArticleReady(
-      const DistilledArticleProto* article_proto) OVERRIDE;
-  virtual void OnArticleUpdated(
-      ArticleDistillationUpdate article_update) OVERRIDE;
-
-  // content::WebContentsObserver implementation.
-  virtual void DidNavigateMainFrame(
-      const content::LoadCommittedDetails& details,
-      const content::FrameNavigateParams& params) OVERRIDE;
-  virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
-  virtual void WebContentsDestroyed() OVERRIDE;
-
-  // Takes ownership of the ViewerHandle to keep distillation alive until |this|
-  // is deleted.
-  void TakeViewerHandle(scoped_ptr<ViewerHandle> viewer_handle);
-
- private:
-  // The handle to the view request towards the DomDistillerService. It
-  // needs to be kept around to ensure the distillation request finishes.
-  scoped_ptr<ViewerHandle> viewer_handle_;
-
-  // The WebContents this class is tracking.
-  content::WebContents* web_contents_;
-};
-
-void SelfDeletingRequestDelegate::DidNavigateMainFrame(
-    const content::LoadCommittedDetails& details,
-    const content::FrameNavigateParams& params) {
-  base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
-}
-
-void SelfDeletingRequestDelegate::RenderProcessGone(
-    base::TerminationStatus status) {
-  base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
-}
-
-void SelfDeletingRequestDelegate::WebContentsDestroyed() {
-  base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
-}
-
-SelfDeletingRequestDelegate::SelfDeletingRequestDelegate(
-    content::WebContents* web_contents)
-    : web_contents_(web_contents) {
-  content::WebContentsObserver::Observe(web_contents_);
-}
-
-SelfDeletingRequestDelegate::~SelfDeletingRequestDelegate() {
-  content::WebContentsObserver::Observe(NULL);
-}
-
-void SelfDeletingRequestDelegate::OnArticleReady(
-    const DistilledArticleProto* article_proto) {
-}
-
-void SelfDeletingRequestDelegate::OnArticleUpdated(
-    ArticleDistillationUpdate article_update) {
-}
-
-void SelfDeletingRequestDelegate::TakeViewerHandle(
-    scoped_ptr<ViewerHandle> viewer_handle) {
-  viewer_handle_ = viewer_handle.Pass();
-}
-
-// Start loading the viewer URL of the current page in |web_contents|.
-void StartNavigationToDistillerViewer(content::WebContents* web_contents,
-                                      const GURL& url) {
-  GURL viewer_url = dom_distiller::url_utils::GetDistillerViewUrlFromUrl(
-      chrome::kDomDistillerScheme, url);
-  content::NavigationController::LoadURLParams params(viewer_url);
-  params.transition_type = content::PAGE_TRANSITION_AUTO_BOOKMARK;
-  web_contents->GetController().LoadURLWithParams(params);
-}
-
-void StartDistillation(content::WebContents* web_contents) {
-  // Start distillation using |web_contents|, and ensure ViewerHandle stays
-  // around until the viewer requests distillation.
-  SelfDeletingRequestDelegate* view_request_delegate =
-      new SelfDeletingRequestDelegate(web_contents);
-  scoped_ptr<content::WebContents> old_web_contents_sptr(web_contents);
-  scoped_ptr<SourcePageHandleWebContents> source_page_handle(
-      new SourcePageHandleWebContents(old_web_contents_sptr.Pass()));
-  DomDistillerService* dom_distiller_service =
-      DomDistillerServiceFactory::GetForBrowserContext(
-          web_contents->GetBrowserContext());
-  scoped_ptr<DistillerPage> distiller_page =
-      dom_distiller_service->CreateDefaultDistillerPageWithHandle(
-                                 source_page_handle.PassAs<SourcePageHandle>())
-          .Pass();
-
-  const GURL& last_committed_url = web_contents->GetLastCommittedURL();
-  scoped_ptr<ViewerHandle> viewer_handle = dom_distiller_service->ViewUrl(
-      view_request_delegate, distiller_page.Pass(), last_committed_url);
-  view_request_delegate->TakeViewerHandle(viewer_handle.Pass());
-}
-
-}  // namespace
-
-void DistillCurrentPageAndView(content::WebContents* old_web_contents) {
-  DCHECK(old_web_contents);
-  // Create new WebContents.
-  content::WebContents::CreateParams create_params(
-      old_web_contents->GetBrowserContext());
-  content::WebContents* new_web_contents =
-      content::WebContents::Create(create_params);
-  DCHECK(new_web_contents);
-
-  // Copy all navigation state from the old WebContents to the new one.
-  new_web_contents->GetController().CopyStateFrom(
-      old_web_contents->GetController());
-
-  CoreTabHelper::FromWebContents(old_web_contents)->delegate()->SwapTabContents(
-      old_web_contents, new_web_contents, false, false);
-
-  StartNavigationToDistillerViewer(new_web_contents,
-                                   old_web_contents->GetLastCommittedURL());
-  StartDistillation(old_web_contents);
-}