Implement <webview>.addContentScript/removeContentScript API [1]

extensions/browser/guest_view/web_view/web_view_guest.h

Index: extensions/browser/guest_view/web_view/web_view_guest.h
diff --git a/extensions/browser/guest_view/web_view/web_view_guest.h b/extensions/browser/guest_view/web_view/web_view_guest.h
index cb190d9230b27414932897b33d77a9821599d5b6..cbf29cdf9df3f73ed58eef3fffba762ead0a892c 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.h
+++ b/extensions/browser/guest_view/web_view/web_view_guest.h
@@ -25,6 +25,7 @@ struct WebFindOptions;
 
 namespace extensions {
 
+class DeclarativeUserScriptMaster;
 class WebViewInternalFindFunction;
 
 // A WebViewGuest provides the browser-side implementation of the <webview> API
@@ -235,11 +236,30 @@ class WebViewGuest : public GuestView<WebViewGuest>,
                  uint32 removal_mask,
                  const base::Closure& callback);
 
+  // Adds content script to inject on the guest.
+  void AddContentScripts(const std::string& script_name,
+                         const UserScript& script);
+
+  // Removes content script by |script_name|.
+  void RemoveContentScripts(const std::string& script_name);
+
+  // Removes all content scripts added by the guest.
+  void RemoveAllContentScripts();
+
+  // Returns whether |host_id_| is nullptr.
+  bool IsHostIDEmpty();
+
   ScriptExecutor* script_executor() { return script_executor_.get(); }
+  const HostID& host_id() { return *host_id_; }
+  void set_host_id(scoped_ptr<const HostID> host_id) {
+    host_id_ = host_id.Pass();
+  }
 
  private:
   friend class WebViewPermissionHelper;
 
+  using UserScriptMap = std::map<std::string, UserScript>;
+
   explicit WebViewGuest(content::WebContents* owner_web_contents);
 
   ~WebViewGuest() override;
@@ -372,6 +392,13 @@ class WebViewGuest : public GuestView<WebViewGuest>,
   // Determines if this guest accepts pinch-zoom gestures.
   bool allow_scaling_;
 
+  // The ID of the injection host of the guest.
+  scoped_ptr<const HostID> host_id_;
+
+  DeclarativeUserScriptMaster* master_;
+
+  UserScriptMap user_script_map_;
+
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<WebViewGuest> weak_ptr_factory_;