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 82 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 73 matching lines @@
       output_configurator_animation_(
           new internal::OutputConfiguratorAnimation()),
 #endif  // defined(OS_CHROMEOS)
       shelf_(NULL),
       panel_layout_manager_(NULL),
       status_area_widget_(NULL),
       browser_context_(NULL) {
   gfx::Screen::SetInstance(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());
   static_cast<internal::MultiDisplayManager*>(
       aura::Env::GetInstance()->display_manager())->InitInternalDisplayInfo();
 #endif  // defined(OS_CHROMEOS)
 }
 
 Shell::~Shell() {
   views::FocusManagerFactory::Install(NULL);
@@ skipping 550 matching lines @@
 }
 
 void Shell::ShowCursor(bool visible) {
   RootWindowList root_windows = GetAllRootWindows();
   for (RootWindowList::iterator iter = root_windows.begin();
        iter != root_windows.end(); ++iter)
     (*iter)->ShowCursor(visible);
 }
 
 }  // namespace ash