Swipe to dismiss suggestions

- Move dismiss suggestion logic into feature provider
- In DashboardData, use hashcode as suggestion's stable id. This is much
  more likely to provide a truely stable id for each suggestion card.
  Eventually I want to use hash for all tiles to provide stable id.
- Add a SuggestionDismissionController to handle swipe to dismiss
  callbacks

Change-Id: If3770f07a90c5469a0b86fc28f3eb5e4c17227cd
Fix: 35159816
Test: make RunSettingsRoboTests

src/com/android/settings/applications/AppStorageSettings.java

@@ -30,7 +30,6 @@ import android.content.pm.IPackageDataObserver;
 import android.content.pm.PackageManager;
 import android.content.pm.ProviderInfo;
 import android.os.Bundle;
-import android.os.Environment;
 import android.os.Handler;
 import android.os.Message;
 import android.os.RemoteException;
@@ -39,7 +38,6 @@ import android.os.storage.StorageManager;
 import android.os.storage.VolumeInfo;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceCategory;
-import android.text.format.Formatter;
 import android.util.Log;
 import android.util.MutableInt;
 import android.view.View;
@@ -51,8 +49,6 @@ import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.deviceinfo.StorageWizardMoveConfirm;
 import com.android.settingslib.RestrictedLockUtils;
-import com.android.settingslib.applications.ApplicationsState;
-import com.android.settingslib.applications.ApplicationsState.AppEntry;
 import com.android.settingslib.applications.ApplicationsState.Callbacks;
 import com.android.settingslib.applications.StorageStatsSource;
 import com.android.settingslib.applications.StorageStatsSource.AppStorageStats;