Prepare declarativeContent API for new script injection feature. Added Javascript types and functio…

extensions/renderer/content_watcher.h

 // 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.
 
 #ifndef EXTENSIONS_RENDERER_CONTENT_WATCHER_H_
 #define EXTENSIONS_RENDERER_CONTENT_WATCHER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 13 matching lines @@
 
 // Watches the content of WebFrames to notify extensions when they match various
 // patterns.  This class tracks the set of relevant patterns (set by
 // ExtensionMsg_WatchPages) and the set that match on each WebFrame, and sends a
 // ExtensionHostMsg_OnWatchedPageChange whenever a RenderView's set changes.
 //
 // There's one ContentWatcher per Dispatcher rather than per RenderView because
 // WebFrames can move between RenderViews through adoptNode.
 class ContentWatcher {
  public:
-  ContentWatcher();
-  ~ContentWatcher();
+  ContentWatcher(const std::string& event_name);
+  virtual ~ContentWatcher();
 
-  // Handler for ExtensionMsg_WatchPages.
+  // Indirect handler for ExtensionMsg_WatchPages (mediated by
+  // Dispatcher::OnWatchPages).
   void OnWatchPages(const std::vector<std::string>& css_selectors);
 
   // Uses WebDocument::watchCSSSelectors to watch the selectors in
   // css_selectors_ and get a callback into DidMatchCSS() whenever the set of
   // matching selectors in |frame| changes.
   void DidCreateDocumentElement(blink::WebFrame* frame);
 
   // Records that |newly_matching_selectors| have started matching on |*frame|,
   // and |stopped_matching_selectors| have stopped matching.
   void DidMatchCSS(
       blink::WebFrame* frame,
       const blink::WebVector<blink::WebString>& newly_matching_selectors,
       const blink::WebVector<blink::WebString>& stopped_matching_selectors);
 
  private:
   // Given that we saw a change in the CSS selectors that |changed_frame|
   // matched, tell the browser about the new set of matching selectors in its
   // top-level page.  We filter this so that if an extension were to be granted
   // activeTab permission on that top-level page, we only send CSS selectors for
   // frames that it could run on.
   void NotifyBrowserOfChange(blink::WebFrame* changed_frame) const;
 
+  // Event name associated with the browser-side component that corresponds to
+  // this content watcher (included in ExtensionMsg_WatchPages messages).
+  std::string event_name_;
+
   // If any of these selectors match on a page, we need to send an
   // ExtensionHostMsg_OnWatchedPageChange back to the browser.
   blink::WebVector<blink::WebString> css_selectors_;
 
   // Maps live WebFrames to the set of CSS selectors they match. Blink sends
   // back diffs, which we apply to these sets.
   std::map<blink::WebFrame*, std::set<std::string> > matching_selectors_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_CONTENT_WATCHER_H_