Move Tab's top controls visibility to a delegate

chrome/android/java/src/org/chromium/chrome/browser/tab/TopControlsVisibilityDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/TopControlsVisibilityDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/TopControlsVisibilityDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/TopControlsVisibilityDelegate.java
new file mode 100644
index 0000000000000000000000000000000000000000..ac0dcddad25113f5e431e77673f5c557b499fd63
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/TopControlsVisibilityDelegate.java
@@ -0,0 +1,67 @@
+// Copyright 2015 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.tab;
+
+import org.chromium.chrome.browser.UrlConstants;
+import org.chromium.chrome.browser.device.DeviceClassManager;
+import org.chromium.chrome.browser.ssl.ConnectionSecurityLevel;
+import org.chromium.chrome.browser.util.AccessibilityUtil;
+import org.chromium.content.browser.ContentViewCore;
+import org.chromium.content_public.browser.WebContents;
+
+/**
+ * A delegate to determine visibility of the top controls.
+ */
+public class TopControlsVisibilityDelegate {
+    protected final Tab mTab;
+
+    /**
+     * Basic constructor.
+     * @param tab The associated {@link Tab}.
+     */
+    public TopControlsVisibilityDelegate(Tab tab) {
+        mTab = tab;
+    }
+
+    /**
+     * @return Whether hiding top controls is enabled or not.
+     */
+    public boolean isHidingTopControlsEnabled() {
+        WebContents webContents = mTab.getWebContents();
+        if (webContents == null || webContents.isDestroyed()) return false;
+
+        String url = mTab.getUrl();
+        boolean enableHidingTopControls = url != null;
+        enableHidingTopControls &= !url.startsWith(UrlConstants.CHROME_SCHEME);
+        enableHidingTopControls &= !url.startsWith(UrlConstants.CHROME_NATIVE_SCHEME);
+
+        int securityState = mTab.getSecurityLevel();
+        enableHidingTopControls &= (securityState != ConnectionSecurityLevel.SECURITY_ERROR
+                && securityState != ConnectionSecurityLevel.SECURITY_WARNING);
+
+        enableHidingTopControls &=
+                !AccessibilityUtil.isAccessibilityEnabled(mTab.getApplicationContext());
+
+        ContentViewCore cvc = mTab.getContentViewCore();
+        enableHidingTopControls &= cvc == null || !cvc.isFocusedNodeEditable();
+        enableHidingTopControls &= !mTab.isShowingErrorPage();
+        enableHidingTopControls &= !webContents.isShowingInterstitialPage();
+        enableHidingTopControls &= (mTab.getFullscreenManager() != null);
+        enableHidingTopControls &= DeviceClassManager.enableFullscreen();
+        enableHidingTopControls &= !DeviceClassManager.isAutoHidingToolbarDisabled(
+                mTab.getApplicationContext());
+        enableHidingTopControls &= !mTab.isFullscreenWaitingForLoad();
+
+        return enableHidingTopControls;
+    }
+
+    /**
+     * @return Whether showing top controls is enabled or not.
+     */
+    public boolean isShowingTopControlsEnabled() {
+        if (mTab.getFullscreenManager() == null) return true;
+        return !mTab.getFullscreenManager().getPersistentFullscreenMode();
+    }
+}