Make Page Visibility API work when the browser window is visible or not

content/browser/frame_host/render_widget_host_view_child_frame.cc

 // Copyright 2014 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/frame_host/render_widget_host_view_child_frame.h"
 
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/frame_host/cross_process_frame_connector.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/gpu/gpu_messages.h"
@@ skipping 46 matching lines @@
     return;
   host_->WasShown(ui::LatencyInfo());
 }
 
 void RenderWidgetHostViewChildFrame::Hide() {
   if (host_->is_hidden())
     return;
   host_->WasHidden();
 }
 
+void RenderWidgetHostViewChildFrame::Hide(bool content_visible) {
+  Hide();
+}
+
 bool RenderWidgetHostViewChildFrame::IsShowing() {
   return !host_->is_hidden();
 }
 
 gfx::Rect RenderWidgetHostViewChildFrame::GetViewBounds() const {
   gfx::Rect rect;
   if (frame_connector_)
     rect = frame_connector_->ChildFrameRect();
   return rect;
 }
@@ skipping 226 matching lines @@
 }
 
 BrowserAccessibilityManager*
 RenderWidgetHostViewChildFrame::CreateBrowserAccessibilityManager(
     BrowserAccessibilityDelegate* delegate) {
   return BrowserAccessibilityManager::Create(
       BrowserAccessibilityManager::GetEmptyDocument(), delegate);
 }
 
 }  // namespace content