@Keep all the things in TestAccessPointBuilder

The test in packages/apps/Settings/tests/unit/src/com/android/settings/
wifi/WifiSettingsUiTest.java fails because the TestAccessPointBuilder
class and all methods in it seem to get stripped during build time
since they aren't referenced by code within the settings app itself.

Bug: 33245941
Test: runtest --path packages/apps/Settings/tests/unit/src/com/android/settings/wifi/WifiSettingsUiTest.java
Change-Id: I22b7e9fa54fcd67e0f754aca47907d87db9d7056
Merged-In: I92b56b7908e5be8a3553a2779646d48bb5b94f01

packages/SettingsLib/src/com/android/settingslib/wifi/TestAccessPointBuilder.java

@@ -22,6 +22,7 @@ import android.net.NetworkInfo;
 import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiInfo;
 import android.os.Bundle;
+import android.support.annotation.Keep;
 
 /**
 * Build and return a valid AccessPoint.
@@ -30,6 +31,7 @@ import android.os.Bundle;
 * applications. AccessPoints were designed to only be populated by the mechanisms of scan results
 * and wifi configurations.
 */
+@Keep
 public class TestAccessPointBuilder {
     // match the private values in WifiManager
     private static final int MIN_RSSI = -100;
@@ -49,10 +51,12 @@ public class TestAccessPointBuilder {
 
     Context mContext;
 
+    @Keep
     public TestAccessPointBuilder(Context context) {
         mContext = context;
     }
 
+    @Keep
     public AccessPoint build() {
         Bundle bundle = new Bundle();
 
@@ -77,6 +81,7 @@ public class TestAccessPointBuilder {
         return ap;
     }
 
+    @Keep
     public TestAccessPointBuilder setActive(boolean active) {
         if (active) {
             mNetworkInfo = new NetworkInfo(
@@ -96,6 +101,7 @@ public class TestAccessPointBuilder {
      * <p>Side effect: if this AccessPoint was previously unreachable,
      * setting the level will also make it reachable.
      */
+    @Keep
     public TestAccessPointBuilder setLevel(int level) {
         // Reversal of WifiManager.calculateSignalLevels
         if (level == 0) {
@@ -110,11 +116,13 @@ public class TestAccessPointBuilder {
         return this;
     }
 
+    @Keep
     public TestAccessPointBuilder setNetworkInfo(NetworkInfo info) {
         mNetworkInfo = info;
         return this;
     }
 
+    @Keep
     public TestAccessPointBuilder setRssi(int rssi) {
         mRssi = rssi;
         return this;
@@ -125,6 +133,7 @@ public class TestAccessPointBuilder {
     * Side effect: if the signal level was not previously set,
     * making an AccessPoint reachable will set the signal to the minimum level.
     */
+    @Keep
     public TestAccessPointBuilder setReachable(boolean reachable) {
         if (reachable) {
             // only override the mRssi if it hasn't been set yet
@@ -137,6 +146,7 @@ public class TestAccessPointBuilder {
         return this;
     }
 
+    @Keep
     public TestAccessPointBuilder setSaved(boolean saved){
         if (saved) {
              mNetworkId = 1;
@@ -146,26 +156,31 @@ public class TestAccessPointBuilder {
         return this;
     }
 
+    @Keep
     public TestAccessPointBuilder setSecurity(int security) {
         mSecurity = security;
         return this;
     }
 
+    @Keep
     public TestAccessPointBuilder setSsid(String newSsid) {
         ssid = newSsid;
         return this;
     }
 
+    @Keep
     public TestAccessPointBuilder setFqdn(String fqdn) {
         mFqdn = fqdn;
         return this;
     }
 
+    @Keep
     public TestAccessPointBuilder setProviderFriendlyName(String friendlyName) {
         mProviderFriendlyName = friendlyName;
         return this;
     }
 
+    @Keep
     public TestAccessPointBuilder setWifiInfo(WifiInfo info) {
         mWifiInfo = info;
         return this;
@@ -177,6 +192,7 @@ public class TestAccessPointBuilder {
      * <p>Setting this to a value other than {@link WifiConfiguration#INVALID_NETWORK_ID} makes this
      * AccessPoint a saved network.
      */
+    @Keep
     public TestAccessPointBuilder setNetworkId(int networkId) {
         mNetworkId = networkId;
         return this;