Enable <webview>.executeScript outside of Apps and Extensions [2]

extensions/browser/api/execute_code_function.h

 // Copyright (c) 2013 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_BROWSER_API_EXECUTE_CODE_FUNCTION_H_
 #define EXTENSIONS_BROWSER_API_EXECUTE_CODE_FUNCTION_H_
 
 #include "extensions/browser/extension_function.h"
 #include "extensions/browser/script_executor.h"
 #include "extensions/common/api/extension_types.h"
 #include "extensions/common/host_id.h"
 
 namespace extensions {
 
 // Base class for javascript code injection.
 // This is used by both chrome.webview.executeScript and
 // chrome.tabs.executeScript.
 class ExecuteCodeFunction : public AsyncExtensionFunction {
  public:
+  using WebUILoadFileCallback = base::Callback<void(bool, const std::string&)>;

[asargent_no_longer_on_chrome, 2015/03/17 21:41:14]

nit: please add a comment documenting the meaning of each of the 2 parameters to
the callback (From context I'm assuming they are a flag for success and an error
message, but it would be nice to have this mentioned explicitly to make the code
easier to read)

[Xi Han, 2015/03/17 22:28:21]

Done.

   ExecuteCodeFunction();
 
  protected:
   ~ExecuteCodeFunction() override;
 
   // ExtensionFunction implementation.
   bool HasPermission() override;
   bool RunAsync() override;
 
   // Initialize |details_| if it hasn't already been.
   virtual bool Init() = 0;
   virtual bool ShouldInsertCSS() const = 0;
   virtual bool CanExecuteScriptOnPage() = 0;
   virtual ScriptExecutor* GetScriptExecutor() = 0;
   virtual bool IsWebView() const = 0;
   virtual const GURL& GetWebViewSrc() const = 0;
   virtual void OnExecuteCodeFinished(const std::string& error,
                                      const GURL& on_url,
                                      const base::ListValue& result);
+  virtual bool LoadFileForWebUI(const std::string& file_src,
+                                const WebUILoadFileCallback& callback);
 
   // The injection details.
   scoped_ptr<core_api::extension_types::InjectDetails> details_;
 
   const HostID& host_id() const { return host_id_; }
   void set_host_id(HostID host_id) {
     host_id_ = host_id;
   }
 
  private:
   // Called when contents from the file whose path is specified in JSON
   // arguments has been loaded.
   void DidLoadFile(bool success, const std::string& data);
 
+  // Called when the file is loaded for WebUI.
+  void DidLoadFileForWebUI(bool success, const std::string& data);
+
   // Runs on FILE thread. Loads message bundles for the extension and
   // localizes the CSS data. Calls back DidLoadAndLocalizeFile on the UI thread.
   void GetFileURLAndLocalizeCSS(ScriptExecutor::ScriptType script_type,
                                 const std::string& data,
                                 const std::string& extension_id,
                                 const base::FilePath& extension_path,
                                 const std::string& extension_default_locale);
 
   // Called when contents from the loaded file have been localized.
   void DidLoadAndLocalizeFile(bool success, const std::string& data);
 
   // Run in UI thread.  Code string contains the code to be executed. Returns
   // true on success. If true is returned, this does an AddRef.
   bool Execute(const std::string& code_string);
 
   // Contains extension resource built from path of file which is
   // specified in JSON arguments.
   ExtensionResource resource_;
 
   // The URL of the file being injected into the page.
   GURL file_url_;
 
   // The ID of the injection host.
   HostID host_id_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_EXECUTE_CODE_FUNCTION_H_