Introduce default implementation for TabContentsDelegate::ViewSourceForTab.

chrome/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2010 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/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 1505 matching lines @@
   *enable_decrement = *enable_increment = false;
   int percent = static_cast<int>(
       WebKit::WebView::zoomLevelToZoomFactor(GetZoomLevel()) * 100);
   *enable_decrement = percent > minimum_zoom_percent_;
   *enable_increment = percent < maximum_zoom_percent_;
   return percent;
 }
 
 void TabContents::ViewSource()
 {
-  if (delegate_)
-    delegate_->ViewSourceForTab(this);
+  if (!delegate_)
+    return;
+
+  NavigationEntry* active_entry = controller().GetActiveEntry();
+  if (!active_entry)
+    return;
+
+  delegate_->ViewSourceForTab(this, active_entry->url());
 }
 
 // Notifies the RenderWidgetHost instance about the fact that the page is
 // loading, or done loading and calls the base implementation.
 void TabContents::SetIsLoading(bool is_loading,
                                LoadNotificationDetails* details) {
   if (is_loading == is_loading_)
     return;
 
   if (!is_loading) {
@@ skipping 1769 matching lines @@
 }
 
 void TabContents::SwapInRenderViewHost(RenderViewHost* rvh) {
   render_manager_.SwapInRenderViewHost(rvh);
 }
 
 void TabContents::CreateViewAndSetSizeForRVH(RenderViewHost* rvh) {
   RenderWidgetHostView* rwh_view = view()->CreateViewForWidget(rvh);
   rwh_view->SetSize(view()->GetContainerSize());
 }