Add "panel_fitting" GPU feature type and use it for mirror mode.

ash/shell.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 "ash/shell.h"
 
 #include <algorithm>
 #include <string>
 
 #include "ash/accelerators/focus_manager_factory.h"
@@ skipping 76 matching lines @@
 #if !defined(OS_MACOSX)
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/accelerators/accelerator_filter.h"
 #include "ash/accelerators/nested_dispatcher_controller.h"
 #endif
 
 #if defined(OS_CHROMEOS)
 #include "ash/display/output_configurator_animation.h"
 #include "base/message_pump_aurax11.h"
 #include "chromeos/display/output_configurator.h"
+#include "content/public/browser/gpu_data_manager.h"
+#include "content/public/common/gpu_feature_type.h"
 #endif  // defined(OS_CHROMEOS)
 
 namespace ash {
 
 namespace {
 
 using aura::Window;
 using views::Widget;
 
 // This dummy class is used for shell unit tests. We dont have chrome delegate
@@ skipping 75 matching lines @@
 #if defined(OS_CHROMEOS)
       output_configurator_(new chromeos::OutputConfigurator()),
       output_configurator_animation_(
           new internal::OutputConfiguratorAnimation()),
 #endif  // defined(OS_CHROMEOS)
       browser_context_(NULL) {
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, screen_);
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE, screen_);
   ui_controls::InstallUIControlsAura(internal::CreateUIControls());
 #if defined(OS_CHROMEOS)
+  content::GpuFeatureType blacklisted_features =
+      content::GpuDataManager::GetInstance()->GetBlacklistedFeatures();
+  bool is_panel_fitting_disabled =
+      (blacklisted_features & content::GPU_FEATURE_TYPE_PANEL_FITTING) ||
+      CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kAshDisablePanelFitting);
+  output_configurator_->Init(!is_panel_fitting_disabled);
+
   output_configurator_->AddObserver(output_configurator_animation_.get());
   base::MessagePumpAuraX11::Current()->AddDispatcherForRootWindow(
       output_configurator());
 #endif  // defined(OS_CHROMEOS)
 }
 
 Shell::~Shell() {
   views::FocusManagerFactory::Install(NULL);
 
   // Remove the focus from any window. This will prevent overhead and side
@@ skipping 546 matching lines @@
        iter != controllers.end(); ++iter) {
     if ((*iter)->GetSystemModalLayoutManager(window)->
             CanWindowReceiveEvents(window)) {
       return true;
     }
   }
   return false;
 }
 
 }  // namespace ash