Auto open and close the palette on an eject event.

ash/common/palette_delegate.h

Index: ash/common/palette_delegate.h
diff --git a/ash/common/palette_delegate.h b/ash/common/palette_delegate.h
index 2c0d241ffacd39b093f70446b09ae7c83301dccb..260510bc1a7fb78dd191c06933720bd5db1f6d8f 100644
--- a/ash/common/palette_delegate.h
+++ b/ash/common/palette_delegate.h
@@ -25,6 +25,10 @@ class PaletteDelegate {
   // Enables or disables the partial magnifier.
   virtual void SetPartialMagnifierState(bool enabled) = 0;
 
+  // Returns true if the palette should be automatically opened on an eject
+  // event.
+  virtual bool ShouldAutoOpenPalette() = 0;
+
   // Take a screenshot of the entire window.
   virtual void TakeScreenshot() = 0;