Propagate view background color when changing visible web contents.

chrome/browser/ui/browser.cc

 // Copyright 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.
 
 #include "chrome/browser/ui/browser.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 1833 matching lines @@
   return size;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // Browser, CoreTabHelperDelegate implementation:
 
 void Browser::SwapTabContents(content::WebContents* old_contents,
                               content::WebContents* new_contents,
                               bool did_start_load,
                               bool did_finish_load) {
+  // Copies the background color from an old WebContents to a new one that
+  // replaces it on the screen. This allows the new WebContents to use the
+  // old one's background color as the starting background color, before having
+  // loaded any contents. As a result, we avoid flashing white when navigating
+  // from a site whith a dark background to another site with a dark background.
+  if (old_contents && new_contents) {
+    RenderWidgetHostView* old_view = old_contents->GetMainFrame()->GetView();
+    RenderWidgetHostView* new_view = new_contents->GetMainFrame()->GetView();
+    if (old_view && new_view)
+      new_view->SetBackgroundColor(old_view->background_color());
+  }
+
   int index = tab_strip_model_->GetIndexOfWebContents(old_contents);
   DCHECK_NE(TabStripModel::kNoTab, index);
   tab_strip_model_->ReplaceWebContentsAt(index, new_contents);
 }
 
 bool Browser::CanReloadContents(content::WebContents* web_contents) const {
   return chrome::CanReload(this);
 }
 
 bool Browser::CanSaveContents(content::WebContents* web_contents) const {
@@ skipping 719 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         ui::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }