[Merge to M59] Avoid Showing rotation change notification when source is accelerometer

ash/system/screen_layout_observer.cc

Index: ash/system/screen_layout_observer.cc
diff --git a/ash/system/screen_layout_observer.cc b/ash/system/screen_layout_observer.cc
index c7ea0e5f89313181e426e16cb7fec05355fa4cb1..001154b7cb8793a38a9f729f26edb33dd7c8682a 100644
--- a/ash/system/screen_layout_observer.cc
+++ b/ash/system/screen_layout_observer.cc
@@ -296,8 +296,12 @@ bool ScreenLayoutObserver::GetDisplayMessageForNotification(
           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: