Log support disclaimer dialog visibility change.

Bug: 30681529
Test: RunSettingsRoboTests

Added InstrumentedDialogFragment, and use it to observe visiblity
changes in support disclaimer fragment.

Change-Id: I9f851c4769f8d59e791986fffc145d014ffde3a3

src/com/android/settings/core/instrumentation/InstrumentedDialogFragment.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2016 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.core.instrumentation;
+
+import com.android.settings.core.lifecycle.ObservableDialogFragment;
+
+public abstract class InstrumentedDialogFragment extends ObservableDialogFragment
+        implements Instrumentable {
+
+    public InstrumentedDialogFragment() {
+        mLifecycle.addObserver(new VisibilityLoggerMixin(getMetricsCategory()));
+    }
+
+}

src/com/android/settings/support/SupportDisclaimerDialogFragment.java

@@ -35,14 +35,15 @@ import android.widget.TextView;
 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.logging.MetricsProto;
 import com.android.settings.R;
+import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
 import com.android.settings.overlay.FeatureFactory;
 import com.android.settings.overlay.SupportFeatureProvider;
 
 /**
  * {@link DialogFragment} for support disclaimer.
  */
-public final class SupportDisclaimerDialogFragment extends DialogFragment implements
+public final class SupportDisclaimerDialogFragment extends InstrumentedDialogFragment
-        DialogInterface.OnClickListener {
+        implements DialogInterface.OnClickListener {
 
     public static final String TAG = "SupportDisclaimerDialog";
     private static final String EXTRA_TYPE = "extra_type";
@@ -90,7 +91,7 @@ public final class SupportDisclaimerDialogFragment extends DialogFragment implem
         final Bundle bundle = getArguments();
         MetricsLogger.action(activity, MetricsProto.MetricsEvent.ACTION_SUPPORT_DISCLAIMER_OK);
         supportFeatureProvider.startSupport(getActivity(),
-                (Account) bundle.getParcelable(EXTRA_ACCOUNT), bundle.getInt(EXTRA_TYPE));
+                bundle.getParcelable(EXTRA_ACCOUNT), bundle.getInt(EXTRA_TYPE));
     }
 
     @Override
@@ -115,6 +116,11 @@ public final class SupportDisclaimerDialogFragment extends DialogFragment implem
         }
     }
 
+    @Override
+    public int getMetricsCategory() {
+        return MetricsProto.MetricsEvent.DIALOG_SUPPORT_DISCLAIMER;
+    }
+
     /**
      * A {@link URLSpan} that doesn't decorate the link with underline.
      */