disable zoom buttons on m-touch screen only

	Bug: 3405875
	check for multi-touch device support
	before disabling the on screen zoom buttons

Change-Id: I3a057d2d06db1e77138eef1d8237802667796567
diff --git a/src/com/android/browser/XLargeUi.java b/src/com/android/browser/XLargeUi.java
index 7a00422..f914183 100644
--- a/src/com/android/browser/XLargeUi.java
+++ b/src/com/android/browser/XLargeUi.java
@@ -20,6 +20,7 @@
 
 import android.app.ActionBar;
 import android.app.Activity;
+import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.ActionMode;
@@ -133,7 +134,9 @@
                 android.R.attr.webViewStyle, privateBrowsing);
         initWebViewSettings(w);
         w.setScrollListener(this);
-        w.getSettings().setDisplayZoomControls(false);
+        boolean supportsMultiTouch = mActivity.getPackageManager()
+                .hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN_MULTITOUCH);
+        w.getSettings().setDisplayZoomControls(!supportsMultiTouch);
         w.setExpandedTileBounds(true);  // smoother scrolling
         return w;
     }