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

chrome/browser/webview/webview_guest.cc

 // Copyright 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/webview/webview_guest.h"
 
 #include "base/lazy_instance.h"
 #include "chrome/browser/extensions/api/web_request/web_request_api.h"
 #include "chrome/browser/extensions/api/webview/webview_api_constants.h"
 #include "chrome/browser/extensions/event_router.h"
@@ skipping 51 matching lines @@
 
 // static
 WebViewGuest* WebViewGuest::From(int embedder_process_id,
                                  int guest_instance_id) {
   WebViewGuestMap* guest_map = webview_guest_map.Pointer();
   WebViewGuestMap::iterator it = guest_map->find(
       std::make_pair(embedder_process_id, guest_instance_id));
   return it == guest_map->end() ? NULL : it->second;
 }
 
+void WebViewGuest::Go(int relative_index) {
+  web_contents()->GetController().GoToOffset(relative_index);
+}
+
 WebViewGuest::~WebViewGuest() {
   std::pair<int, int> key(embedder_render_process_id_, guest_instance_id_);
   webview_guest_map.Get().erase(key);
 }
 
 void WebViewGuest::DispatchEvent(const std::string& event_name,
                                  scoped_ptr<DictionaryValue> event) {
   Profile* profile = Profile::FromBrowserContext(
       web_contents()->GetBrowserContext());
 
@@ skipping 11 matching lines @@
 
 void WebViewGuest::DidCommitProvisionalLoadForFrame(
     int64 frame_id,
     bool is_main_frame,
     const GURL& url,
     content::PageTransition transition_type,
     content::RenderViewHost* render_view_host) {
   scoped_ptr<DictionaryValue> event(new DictionaryValue());
   event->SetString(keys::kUrl, url.spec());
   event->SetBoolean(keys::kIsTopLevel, is_main_frame);
+  event->SetInteger(keys::kCurrentEntryIndex,
+      web_contents()->GetController().GetCurrentEntryIndex());
+  event->SetInteger(keys::kEntryCount,
+      web_contents()->GetController().GetEntryCount());
   DispatchEvent(keys::kEventLoadCommit, event.Pass());
 }
 
 void WebViewGuest::WebContentsDestroyed(WebContents* web_contents) {
   RemoveWebViewFromExtensionRendererState(web_contents);
   content::BrowserThread::PostTask(
       content::BrowserThread::IO,
       FROM_HERE,
       base::Bind(
           &RemoveWebViewEventListenersOnIOThread,
@@ skipping 27 matching lines @@
   content::BrowserThread::PostTask(
       content::BrowserThread::IO, FROM_HERE,
       base::Bind(
           &ExtensionRendererState::RemoveWebView,
           base::Unretained(ExtensionRendererState::GetInstance()),
           web_contents->GetRenderProcessHost()->GetID(),
           web_contents->GetRoutingID()));
 }
 
 }  // namespace chrome