Prevent DisplayPreferences from saving incorrect rotations.

ui/gfx/display.h

Index: ui/gfx/display.h
diff --git a/ui/gfx/display.h b/ui/gfx/display.h
index fe2a40cf632b6fa81c5fa7119b2f87b1574cef0e..8b05e707e9c3bb400983540b4fd305c5210bfeea 100644
--- a/ui/gfx/display.h
+++ b/ui/gfx/display.h
@@ -30,6 +30,16 @@ class GFX_EXPORT Display {
     ROTATE_270,
   };
 
+  // The display rotation can have multiple causes for change. A user can set a
+  // preference. On devices with accelerometers, they can change the rotation.
+  // RotationSource allows for the tracking of a Rotation per source of the
+  // change.
+  enum RotationSource {
+    ROTATION_SOURCE_ACCELEROMETER = 0,
+    ROTATION_SOURCE_ACTIVE,

[oshima, 2015/04/17 17:52:44]

document what ACTIVE means.

[jonross, 2015/04/17 19:40:04]

Done.

+    ROTATION_SOURCE_USER,
+  };
+
   // Touch support for the display.
   enum TouchSupport {
     TOUCH_SUPPORT_UNKNOWN,