Settings Rewrite: Fork SyncSetupHandler for MD-Settings

content/public/browser/web_ui_message_handler.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_WEB_UI_MESSAGE_HANDLER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_UI_MESSAGE_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/strings/string16.h"
@@ skipping 10 matching lines @@
 namespace content {
 
 class WebUI;
 class WebUIImpl;
 
 // Messages sent from the DOM are forwarded via the WebUI to handler
 // classes. These objects are owned by WebUI and destroyed when the
 // host is destroyed.
 class CONTENT_EXPORT WebUIMessageHandler {
  public:
+  explicit WebUIMessageHandler(WebUI* web_ui) : web_ui_(web_ui) {}
+
+  // DEPRECATED. Use WebUIMessageHandler(WebUI*) constructor instead.
+  // TODO(tommycli): Remove once legacy callers gone.
   WebUIMessageHandler() : web_ui_(nullptr) {}
+
   virtual ~WebUIMessageHandler() {}
 
  protected:
   FRIEND_TEST_ALL_PREFIXES(WebUIMessageHandlerTest, ExtractIntegerValue);
   FRIEND_TEST_ALL_PREFIXES(WebUIMessageHandlerTest, ExtractDoubleValue);
   FRIEND_TEST_ALL_PREFIXES(WebUIMessageHandlerTest, ExtractStringValue);
 
   // Helper methods:
 
   // Extract an integer value from a list Value.
   static bool ExtractIntegerValue(const base::ListValue* value, int* out_int);
 
   // Extract a floating point (double) value from a list Value.
   static bool ExtractDoubleValue(const base::ListValue* value,
                                  double* out_value);
 
   // Extract a string value from a list Value.
   static base::string16 ExtractStringValue(const base::ListValue* value);
 
   // This is where subclasses specify which messages they'd like to handle and
   // perform any additional initialization.. At this point web_ui() will return
   // the associated WebUI object.
   virtual void RegisterMessages() = 0;
 
   // Returns the attached WebUI for this handler.
   WebUI* web_ui() const { return web_ui_; }
 
+  // DEPRECATED. Attach during construction instead. May be kept for testing.
+  // TODO(tommycli): Remove once callers gone - or rename to SetWebUIForTesting.
   // Sets the attached WebUI - exposed to subclasses for testing purposes.
   void set_web_ui(WebUI* web_ui) { web_ui_ = web_ui; }
 
  private:
   // Provide external classes access to web_ui() and set_web_ui().
   friend class WebUIImpl;
   friend class ::WebUIBrowserTest;
 
   WebUI* web_ui_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_UI_MESSAGE_HANDLER_H_