DO NOT MERGE ANYWHERE

(cherrpy pick of commit cc8fcf2efd66afdaa900b4d27e1eb784e8d40752).

Don't open drawer when back is pressed after being launched externally.

Change-Id: I3e8afd68c33b519dd5d6b27e3fa94653c2537612
Fixes: 30743235

packages/DocumentsUI/src/com/android/documentsui/FilesActivity.java

@@ -401,8 +401,13 @@ public class FilesActivity extends BaseActivity {
                 return true;
             }
 
-            // Open the Close drawer if it is closed and we're at the top of a root.
-            if (size <= 1) {
+            final Intent intent = getIntent();
+            final boolean launchedExternally = intent != null && intent.getData() != null
+                    && mState.action == State.ACTION_BROWSE;
+
+            // Open the Close drawer if it is closed and we're at the top of a root, but only when
+            // not launched by another app.
+            if (size <= 1 && !launchedExternally) {
                 mDrawer.setOpen(true);
                 // Remember so we don't just close it again if back is pressed again.
                 mDrawerLastFiddled = System.currentTimeMillis();