Allows top controls to be hidden by default

chrome/android/java/src/org/chromium/chrome/browser/Tab.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser;
 
 import android.app.Activity;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Color;
@@ skipping 2246 matching lines @@
         int securityState = getSecurityLevel();
         enableHidingTopControls &= (securityState != ToolbarModelSecurityLevel.SECURITY_ERROR
                 && securityState != ToolbarModelSecurityLevel.SECURITY_WARNING);
 
         enableHidingTopControls &=
                 !AccessibilityUtil.isAccessibilityEnabled(getApplicationContext());
         return enableHidingTopControls;
     }
 
     /**
+     * @return Whether showing top controls is enabled or not.
+     */
+    public boolean isShowingTopControlsEnabled() {
+        if (mFullscreenManager == null) return true;
+        return !mFullscreenManager.getPersistentFullscreenMode();
+    }
+
+    /**
      * @return The current visibility constraints for the display of top controls.
      *         {@link TopControlsState} defines the valid return options.
      */
     protected int getTopControlsStateConstraints() {
         if (mFullscreenManager == null) return TopControlsState.SHOWN;
 
         boolean enableHidingTopControls = isHidingTopControlsEnabled();
-        boolean enableShowingTopControls = !mFullscreenManager.getPersistentFullscreenMode();
+        boolean enableShowingTopControls = isShowingTopControlsEnabled();
 
         int constraints = TopControlsState.BOTH;
         if (!enableShowingTopControls) {
             constraints = TopControlsState.HIDDEN;
         } else if (!enableHidingTopControls) {
             constraints = TopControlsState.SHOWN;
         }
         return constraints;
     }
 
@@ skipping 184 matching lines @@
     private native void nativeSetInterceptNavigationDelegate(long nativeTabAndroid,
             InterceptNavigationDelegate delegate);
     private native void nativeAttachToTabContentManager(long nativeTabAndroid,
             TabContentManager tabContentManager);
     private native void nativeAttachOverlayContentViewCore(long nativeTabAndroid,
             ContentViewCore content, boolean visible);
     private native void nativeDetachOverlayContentViewCore(long nativeTabAndroid,
             ContentViewCore content);
     private static native void nativeRecordStartupToCommitUma();
 }