Add global HTTP proxy to Privacy Settings page

This CL allows the user to see on the Enterprise Privacy Settings
page whether the admin set a global HTTP proxy.

Test: make RunSettingsRoboTests
Bug: 32692748

Change-Id: I3c7c46f806f39c90425fd8e098a749f3cc1e9278

src/com/android/settings/enterprise/EnterprisePrivacyFeatureProvider.java

@@ -58,4 +58,9 @@ public interface EnterprisePrivacyFeatureProvider {
      * Returns whether the Profile Owner in the managed profile (if any) set an always-on VPN.
      */
     boolean isAlwaysOnVpnSetInManagedProfile();
+
+    /**
+     * Returns whether the Device Owner set a recommended global HTTP proxy.
+     */
+    boolean isGlobalHttpProxySet();
 }

src/com/android/settings/enterprise/EnterprisePrivacyFeatureProviderImpl.java

@@ -96,4 +96,9 @@ public class EnterprisePrivacyFeatureProviderImpl implements EnterprisePrivacyFe
         return managedProfileUserId != -1 &&
                 VpnUtils.isAlwaysOnVpnSet(mCm, managedProfileUserId);
     }
+
+    @Override
+    public boolean isGlobalHttpProxySet() {
+        return mCm.getGlobalProxy() != null;
+    }
 }

src/com/android/settings/enterprise/EnterprisePrivacySettings.java

@@ -63,6 +63,7 @@ public class EnterprisePrivacySettings extends DashboardFragment {
         controllers.add(new SecurityLogsPreferenceController(context));
         controllers.add(new AlwaysOnVpnPrimaryUserPreferenceController(context));
         controllers.add(new AlwaysOnVpnManagedProfilePreferenceController(context));
+        controllers.add(new GlobalHttpProxyPreferenceController(context));
         return controllers;
     }
 

src/com/android/settings/enterprise/GlobalHttpProxyPreferenceController.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+package com.android.settings.enterprise;
+
+import android.content.Context;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.core.PreferenceController;
+import com.android.settings.overlay.FeatureFactory;
+
+public class GlobalHttpProxyPreferenceController extends PreferenceController {
+
+    private static final String KEY_GLOBAL_HTTP_PROXY = "global_http_proxy";
+    private final EnterprisePrivacyFeatureProvider mFeatureProvider;
+
+    public GlobalHttpProxyPreferenceController(Context context) {
+        super(context);
+        mFeatureProvider = FeatureFactory.getFactory(context)
+                .getEnterprisePrivacyFeatureProvider(context);
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        preference.setVisible(mFeatureProvider.isGlobalHttpProxySet());
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return true;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_GLOBAL_HTTP_PROXY;
+    }
+}