Fix share popup is not aligned with viewfinder.

bug:5641001
Change-Id: I0d77a93a9c0ef5b7b661abf36028eb559981dc67
diff --git a/res/layout/share_popup.xml b/res/layout/share_popup.xml
index 19b2152..087d8c7 100644
--- a/res/layout/share_popup.xml
+++ b/res/layout/share_popup.xml
@@ -25,7 +25,7 @@
     <FrameLayout android:id="@+id/root"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:layout_gravity="left|center">
+            android:layout_gravity="top|center">
         <com.android.camera.ui.RotateLayout
                 android:id="@+id/thumbnail_rotate_layout"
                 android:layout_width="wrap_content"