aura: fix flashing when switching tabs rapidly

content/browser/renderer_host/render_widget_host_view_aura.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/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 600 matching lines @@
     resize_locks_.clear();
   }
 }
 
 void RenderWidgetHostViewAura::AcceleratedSurfaceBuffersSwapped(
     const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params_in_pixel,
     int gpu_host_id) {
   surface_route_id_ = params_in_pixel.route_id;
   // If protection state changed, then this swap is stale. We must still ACK but
   // do not update current_surface_ since it may have been discarded.
-  if (host_->is_hidden() ||
-      (params_in_pixel.protection_state_id &&
-          params_in_pixel.protection_state_id != protection_state_id_)) {
+  if (params_in_pixel.protection_state_id &&
+      params_in_pixel.protection_state_id != protection_state_id_) {
     DCHECK(!current_surface_);
     if (!params_in_pixel.skip_ack)
       InsertSyncPointAndACK(params_in_pixel.route_id, gpu_host_id, NULL);
     return;
   }
   current_surface_ = params_in_pixel.surface_handle;
   // If we don't require an ACK that means the content is not a fresh updated
   // new frame, rather we are just resetting our handle to some old content that
   // we still hadn't discarded. Although we could display immediately, by not
   // resetting the compositor lock here, we give us some time to get a fresh
@@ skipping 48 matching lines @@
     }
   }
 }
 
 void RenderWidgetHostViewAura::AcceleratedSurfacePostSubBuffer(
     const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params_in_pixel,
     int gpu_host_id) {
   surface_route_id_ = params_in_pixel.route_id;
   // If visible state changed, then this PSB is stale. We must still ACK but
   // do not update current_surface_.
-  if (host_->is_hidden() ||
-      (params_in_pixel.protection_state_id &&
-          params_in_pixel.protection_state_id != protection_state_id_)) {
+  if (params_in_pixel.protection_state_id &&
+      params_in_pixel.protection_state_id != protection_state_id_) {
     DCHECK(!current_surface_);
     InsertSyncPointAndACK(params_in_pixel.route_id, gpu_host_id, NULL);
     return;
   }
   current_surface_ = params_in_pixel.surface_handle;
   released_front_lock_ = NULL;
   DCHECK(current_surface_);
   UpdateExternalTexture();
 
   ui::Compositor* compositor = GetCompositor();
@@ skipping 951 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content