Fix disappearing translucent status bar background

When relaunching an activity while preserving the window, the content
view was put on top of the status bar background, making it disappear
in case of translucent status bar backgrounds.

Change-Id: I1edff29c10616bf5386e982d7336327135f0f7a0
diff --git a/core/java/com/android/internal/policy/DecorView.java b/core/java/com/android/internal/policy/DecorView.java
index d4ada95..b2ae835 100644
--- a/core/java/com/android/internal/policy/DecorView.java
+++ b/core/java/com/android/internal/policy/DecorView.java
@@ -1706,7 +1706,9 @@
             mDecorCaptionView.addView(root,
                     new ViewGroup.MarginLayoutParams(MATCH_PARENT, MATCH_PARENT));
         } else {
-            addView(root, new ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT));
+
+            // Put it below the color views.
+            addView(root, 0, new ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT));
         }
         mContentRoot = (ViewGroup) root;
         initializeElevation();