Avoid Showing rotation change notification when source is accelerometer

ash/system/screen_layout_observer.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/system/screen_layout_observer.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 253 matching lines @@
       return false;
     }
 
     if (iter.second.configured_ui_scale() !=
         old_iter->second.configured_ui_scale()) {
       *out_additional_message = l10n_util::GetStringFUTF16(
           IDS_ASH_STATUS_TRAY_DISPLAY_RESOLUTION_CHANGED,
           GetDisplayName(iter.first), GetDisplaySize(iter.first));
       return true;
     }
-    if (iter.second.GetActiveRotation() !=
-        old_iter->second.GetActiveRotation()) {
+    // We don't show rotation change notification when the rotation source is
+    // the accelerometer.
+    if (iter.second.active_rotation_source() !=
+            display::Display::ROTATION_SOURCE_ACCELEROMETER &&
+        iter.second.GetActiveRotation() !=
+            old_iter->second.GetActiveRotation()) {
       int rotation_text_id = 0;
       switch (iter.second.GetActiveRotation()) {
         case display::Display::ROTATE_0:
           rotation_text_id = IDS_ASH_STATUS_TRAY_DISPLAY_STANDARD_ORIENTATION;
           break;
         case display::Display::ROTATE_90:
           rotation_text_id = IDS_ASH_STATUS_TRAY_DISPLAY_ORIENTATION_90;
           break;
         case display::Display::ROTATE_180:
           rotation_text_id = IDS_ASH_STATUS_TRAY_DISPLAY_ORIENTATION_180;
@@ skipping 104 matching lines @@
       return true;
 
     default:
       // Mirror mode was turned off; other messages should be shown e.g.
       // extended mode is on, ... etc.
       return false;
   }
 }
 
 }  // namespace ash