QS: Back button closes detail (if showing)

Bug:16649931
Change-Id: I9748a0793e6a71d833f7c7f884c189e16cccb8f9
diff --git a/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java b/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java
index 4901f40..d216069 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java
+++ b/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java
@@ -95,7 +95,7 @@
         mDetailDoneButton.setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
-                showDetail(false, mDetailRecord);
+                closeDetail();
             }
         });
     }
@@ -134,7 +134,7 @@
         if (mExpanded == expanded) return;
         mExpanded = expanded;
         if (!mExpanded) {
-            showDetail(false /*show*/, mDetailRecord);
+            closeDetail();
         }
     }
 
@@ -226,6 +226,14 @@
         addView(r.tileView);
     }
 
+    public boolean isShowingDetail() {
+        return mDetailRecord != null;
+    }
+
+    public void closeDetail() {
+        showDetail(false, mDetailRecord);
+    }
+
     private void handleShowDetail(Record r, boolean show) {
         if (r instanceof TileRecord) {
             handleShowDetailTile((TileRecord) r, show);