Uses copy request to flatten the layers to do screen rotation animation.

chrome/browser/about_flags.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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 2398 matching lines @@
      IDS_FLAGS_USE_NEW_DOODLE_API_DESCRIPTION, kOsAndroid,
      FEATURE_VALUE_TYPE(chrome::android::kUseNewDoodleApi)},
 #endif  // OS_ANDROID
 
     {"delay-navigation", IDS_FLAGS_DELAY_NAVIGATION_NAME,
      IDS_FLAGS_DELAY_NAVIGATION_DESCRIPTION, kOsAll,
      FEATURE_WITH_PARAMS_VALUE_TYPE(kDelayNavigationFeature,
                                     kDelayNavigationFeatureVariations,
                                     "DelayNavigation")},
 
+#if defined(USE_ASH)
+    {"ash-enable-smooth-screen-rotation-animation",
+     IDS_FLAGS_ASH_ENABLE_SMOOTH_SCREEN_ROTATION_ANIMATION_NAME,
+     IDS_FLAGS_ASH_ENABLE_SMOOTH_SCREEN_ROTATION_ANIMATION_DESCRIPTION, kOsCrOS,
+     SINGLE_VALUE_TYPE(ash::switches::kAshEnableSmoothScreenRotationAnimation)},
+#endif  // defined(USE_ASH)
+
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
 };
 
 class FlagsStateSingleton {
  public:
   FlagsStateSingleton()
       : flags_state_(kFeatureEntries, arraysize(kFeatureEntries)) {}
   ~FlagsStateSingleton() {}
@@ skipping 188 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags