Stop disabling force_compositing_mode for background RenderViews.

content/browser/web_contents/web_contents_impl.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 3098 matching lines @@
   dialog_manager_->RunBeforeUnloadDialog(
       this, message, is_reload,
       base::Bind(&WebContentsImpl::OnDialogClosed, base::Unretained(this),
                  rfh, reply_msg, false));
 }
 
 WebContents* WebContentsImpl::GetAsWebContents() {
   return this;
 }
 
+bool WebContentsImpl::IsNeverVisible() {
+  if (!delegate_)
+    return false;
+  return delegate_->IsNeverVisible(this);
+}
+
 RenderViewHostDelegateView* WebContentsImpl::GetDelegateView() {
   return render_view_host_delegate_view_;
 }
 
 RendererPreferences WebContentsImpl::GetRendererPrefs(
     BrowserContext* browser_context) const {
   return renderer_preferences_;
 }
 
 gfx::Rect WebContentsImpl::GetRootWindowResizerRect() const {
@@ skipping 738 matching lines @@
 
 void WebContentsImpl::OnPreferredSizeChanged(const gfx::Size& old_size) {
   if (!delegate_)
     return;
   const gfx::Size new_size = GetPreferredSize();
   if (new_size != old_size)
     delegate_->UpdatePreferredSize(this, new_size);
 }
 
 }  // namespace content