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

extensions/renderer/content_watcher.h

Index: extensions/renderer/content_watcher.h
diff --git a/extensions/renderer/content_watcher.h b/extensions/renderer/content_watcher.h
index 3e3e79622f712a1eb0d01efdb461755f3f03db34..9fe92efdcec43d0abab649b1e938a8da9033bb12 100644
--- a/extensions/renderer/content_watcher.h
+++ b/extensions/renderer/content_watcher.h
@@ -31,10 +31,11 @@ class NativeHandler;
 // 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
@@ -57,6 +58,10 @@ class ContentWatcher {
   // 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_;