<webview>: Move back, forward, canGoBack, canGoForward, go from content to chrome

chrome/browser/extensions/api/webview/webview_api.cc

 // 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.
 
 #include "chrome/browser/extensions/api/webview/webview_api.h"
 
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/webview/webview_guest.h"
 #include "chrome/common/extensions/api/webview.h"
 #include "content/public/browser/render_process_host.h"
@@ skipping 46 matching lines @@
   if (!guest)
     return NULL;
 
   return guest->script_executor();
 }
 
 bool WebviewExecuteCodeFunction::IsWebView() const {
   return true;
 }
 
+WebviewExecuteScriptFunction::WebviewExecuteScriptFunction() {
+}
+
 void WebviewExecuteScriptFunction::OnExecuteCodeFinished(
     const std::string& error,
     int32 on_page_id,
     const GURL& on_url,
     const base::ListValue& result) {
   content::RecordAction(content::UserMetricsAction("WebView.ExecuteScript"));
   if (error.empty())
     SetResult(result.DeepCopy());
   WebviewExecuteCodeFunction::OnExecuteCodeFinished(error, on_page_id, on_url,
                                                     result);
 }
 
+WebviewInsertCSSFunction::WebviewInsertCSSFunction() {
+}
+
 bool WebviewInsertCSSFunction::ShouldInsertCSS() const {
   return true;
 }
 
+WebviewGoFunction::WebviewGoFunction() {
+}
+
+WebviewGoFunction::~WebviewGoFunction() {
+}
+
+bool WebviewGoFunction::RunImpl() {
+  int instance_id = 0;
+  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &instance_id));
+
+  int relative_index = 0;
+  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(1, &relative_index));
+
+  WebViewGuest* guest = WebViewGuest::From(
+      render_view_host()->GetProcess()->GetID(), instance_id);
+  if (!guest)
+    return false;
+
+  guest->Go(relative_index);
+  return true;
+}