Revert of Encapsulate CSS selector declarative content condition tracking

chrome/browser/extensions/api/declarative_content/declarative_content_css_condition_tracker.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 "chrome/browser/extensions/api/declarative_content/declarative_content_css_condition_tracker.h"
-
-#include <algorithm>
-
-#include "chrome/browser/chrome_notification_types.h"
-#include "chrome/browser/profiles/profile.h"
-#include "content/public/browser/navigation_details.h"
-#include "content/public/browser/notification_service.h"
-#include "content/public/browser/notification_source.h"
-#include "content/public/browser/render_process_host.h"
-#include "extensions/common/extension_messages.h"
-#include "ipc/ipc_message.h"
-#include "ipc/ipc_message_macros.h"
-
-namespace extensions {
-
-//
-// PerWebContentsTracker
-//
-
-// Monitors CSS selector matching state on one WebContents.
-class DeclarativeContentCssConditionTracker::
-      PerWebContentsTracker : public content::WebContentsObserver {
- public:
-  using RequestEvaluationCallback =
-      DeclarativeContentCssConditionTrackerDelegate::WebContentsCallback;
-  using DestroyingCallback =
-      base::Callback<void(PerWebContentsTracker*)>;
-
-  PerWebContentsTracker(
-      content::WebContents* contents,
-      const RequestEvaluationCallback& request_evaluation,
-      const DestroyingCallback& destroying);
-  ~PerWebContentsTracker() override;
-
-  void OnWebContentsNavigation(const content::LoadCommittedDetails& details,
-                               const content::FrameNavigateParams& params);
-
-  // See comment on similar function above.
-  void UpdateMatchingCssSelectorsForTesting(
-      const std::vector<std::string>& matching_css_selectors);
-
-  const std::vector<std::string>& matching_css_selectors() const {
-    return matching_css_selectors_;
-  }
-
- private:
-  // content::WebContentsObserver overrides.
-  bool OnMessageReceived(const IPC::Message& message) override;
-  void WebContentsDestroyed() override;
-
-  void OnWatchedPageChange(const std::vector<std::string>& css_selectors);
-
-  const RequestEvaluationCallback request_evaluation_;
-  const DestroyingCallback destroying_;
-
-  std::vector<std::string> matching_css_selectors_;
-
-  DISALLOW_COPY_AND_ASSIGN(PerWebContentsTracker);
-};
-
-DeclarativeContentCssConditionTracker::PerWebContentsTracker::
-PerWebContentsTracker(
-    content::WebContents* contents,
-    const RequestEvaluationCallback& request_evaluation,
-    const DestroyingCallback& destroying)
-    : WebContentsObserver(contents),
-      request_evaluation_(request_evaluation),
-      destroying_(destroying) {
-}
-
-DeclarativeContentCssConditionTracker::PerWebContentsTracker::
-~PerWebContentsTracker() {
-}
-
-void DeclarativeContentCssConditionTracker::PerWebContentsTracker::
-OnWebContentsNavigation(const content::LoadCommittedDetails& details,
-                        const content::FrameNavigateParams& params) {
-  if (details.is_in_page) {
-    // Within-page navigations don't change the set of elements that
-    // exist, and we only support filtering on the top-level URL, so
-    // this can't change which rules match.
-    return;
-  }
-
-  // Top-level navigation produces a new document. Initially, the
-  // document's empty, so no CSS rules match.  The renderer will send
-  // an ExtensionHostMsg_OnWatchedPageChange later if any CSS rules
-  // match.
-  matching_css_selectors_.clear();
-  request_evaluation_.Run(web_contents());
-}
-
-void DeclarativeContentCssConditionTracker::PerWebContentsTracker::
-UpdateMatchingCssSelectorsForTesting(
-    const std::vector<std::string>& matching_css_selectors) {
-  matching_css_selectors_ = matching_css_selectors;
-  request_evaluation_.Run(web_contents());
-}
-
-bool
-DeclarativeContentCssConditionTracker::PerWebContentsTracker::
-OnMessageReceived(
-    const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(PerWebContentsTracker, message)
-    IPC_MESSAGE_HANDLER(ExtensionHostMsg_OnWatchedPageChange,
-                        OnWatchedPageChange)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-void DeclarativeContentCssConditionTracker::PerWebContentsTracker::
-WebContentsDestroyed() {
-  destroying_.Run(this);
-  delete this;
-}
-
-void
-DeclarativeContentCssConditionTracker::PerWebContentsTracker::
-OnWatchedPageChange(
-    const std::vector<std::string>& css_selectors) {
-  matching_css_selectors_ = css_selectors;
-  request_evaluation_.Run(web_contents());
-}
-
-//
-// DeclarativeContentCssConditionTrackerDelegate
-//
-
-DeclarativeContentCssConditionTrackerDelegate::
-DeclarativeContentCssConditionTrackerDelegate() {}
-
-DeclarativeContentCssConditionTrackerDelegate::
-~DeclarativeContentCssConditionTrackerDelegate() {}
-
-//
-// DeclarativeContentCssConditionTracker
-//
-
-DeclarativeContentCssConditionTracker::DeclarativeContentCssConditionTracker(
-    content::BrowserContext* context,
-    DeclarativeContentCssConditionTrackerDelegate* delegate)
-    : context_(context),
-      delegate_(delegate) {
-  registrar_.Add(this,
-                 content::NOTIFICATION_RENDERER_PROCESS_CREATED,
-                 content::NotificationService::AllBrowserContextsAndSources());
-}
-
-DeclarativeContentCssConditionTracker::
-~DeclarativeContentCssConditionTracker() {
-  // All monitored WebContents are expected to be destroyed before this object.
-  CHECK(per_web_contents_tracker_.empty());
-}
-
-// We use the sorted propery of the set for equality checks with
-// watched_css_selectors_, which is guaranteed to be sorted because it's set
-// from the set contents.
-void DeclarativeContentCssConditionTracker::SetWatchedCssSelectors(
-    const std::set<std::string>& new_watched_css_selectors) {
-  if (new_watched_css_selectors.size() != watched_css_selectors_.size() ||
-      !std::equal(new_watched_css_selectors.begin(),
-                  new_watched_css_selectors.end(),
-                  watched_css_selectors_.begin())) {
-    watched_css_selectors_.assign(new_watched_css_selectors.begin(),
-                                  new_watched_css_selectors.end());
-
-    for (content::RenderProcessHost::iterator it(
-             content::RenderProcessHost::AllHostsIterator());
-         !it.IsAtEnd();
-         it.Advance()) {
-      InstructRenderProcessIfManagingBrowserContext(it.GetCurrentValue());
-    }
-  }
-}
-
-void DeclarativeContentCssConditionTracker::TrackForWebContents(
-    content::WebContents* contents) {
-  CreatePerWebContentsTracker(contents);
-}
-
-void DeclarativeContentCssConditionTracker::OnWebContentsNavigation(
-    content::WebContents* contents,
-    const content::LoadCommittedDetails& details,
-    const content::FrameNavigateParams& params) {
-  per_web_contents_tracker_[contents]->OnWebContentsNavigation(details, params);
-}
-
-void DeclarativeContentCssConditionTracker::GetMatchingCssSelectors(
-    content::WebContents* contents,
-    base::hash_set<std::string>* css_selectors) {
-  const std::vector<std::string>& matching_css_selectors =
-      per_web_contents_tracker_[contents]->matching_css_selectors();
-  css_selectors->insert(matching_css_selectors.begin(),
-                        matching_css_selectors.end());
-}
-
-void DeclarativeContentCssConditionTracker::
-UpdateMatchingCssSelectorsForTesting(
-    content::WebContents* contents,
-    const std::vector<std::string>& matching_css_selectors) {
-  per_web_contents_tracker_[contents]->
-      UpdateMatchingCssSelectorsForTesting(matching_css_selectors);
-}
-
-void DeclarativeContentCssConditionTracker::CreatePerWebContentsTracker(
-    content::WebContents* contents) {
-  // This is a weak pointer; PerWebContentsTracker owns itself.
-  per_web_contents_tracker_[contents] =
-      new PerWebContentsTracker(
-          contents,
-          base::Bind(&DeclarativeContentCssConditionTrackerDelegate::
-                     RequestEvaluation,
-                     base::Unretained(delegate_)),
-          base::Bind(&DeclarativeContentCssConditionTracker::
-                     RemovePerWebContentsTracker,
-                     base::Unretained(this)));
-}
-
-void DeclarativeContentCssConditionTracker::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  switch (type) {
-    case content::NOTIFICATION_RENDERER_PROCESS_CREATED: {
-      content::RenderProcessHost* process =
-          content::Source<content::RenderProcessHost>(source).ptr();
-      InstructRenderProcessIfManagingBrowserContext(process);
-      break;
-    }
-  }
-}
-
-void DeclarativeContentCssConditionTracker::
-InstructRenderProcessIfManagingBrowserContext(
-    content::RenderProcessHost* process) {
-  if (delegate_->ShouldManageConditionsForBrowserContext(
-          process->GetBrowserContext())) {
-    process->Send(new ExtensionMsg_WatchPages(watched_css_selectors_));
-  }
-}
-
-void DeclarativeContentCssConditionTracker::RemovePerWebContentsTracker(
-    PerWebContentsTracker* tracker) {
-  per_web_contents_tracker_.erase(tracker->web_contents());
-}
-
-}  // namespace extensions