[Wi-Fi] Add a new intent handler process for adding new networks panel page.

For the R feature "Add saved networks to the
device for apps", need to handle the new intent case to update the content to be the specific networks in the new intent.

Bug: 146105504
Test: Add following unit test case to check if UI list had been updated:
      getThreeNetworksNewIntent_shouldHaveThreeItemsInUiList.

Change-Id: Id043fabb16ba5a75aa81be8cacd403e62e5268b8

tests/robotests/src/com/android/settings/wifi/addappnetworks/AddAppNetworksFragmentTest.java

@@ -129,8 +129,7 @@ public class AddAppNetworksFragmentTest {
         mAddAppNetworksFragment.mResultCodeArrayList = mFakedResultArrayList;
 
         // Act
-        mAddAppNetworksFragment.mUiToRequestedList = mAddAppNetworksFragment.filterSavedNetworks(
-                mFakeSavedNetworksList);
+        mAddAppNetworksFragment.filterSavedNetworks(mFakeSavedNetworksList);
 
         // Assert
         assertThat(mAddAppNetworksFragment.mUiToRequestedList).hasSize(1);
@@ -146,6 +145,23 @@ public class AddAppNetworksFragmentTest {
                 SettingsEnums.PANEL_ADD_WIFI_NETWORKS);
     }
 
+    @Test
+    public void getThreeNetworksNewIntent_shouldHaveThreeItemsInUiList() {
+        addOneSpecifiedNetworkConfig(mNewWpaConfigEntry);
+        setUpBundle(mFakedSpecifiedNetworksList);
+        setupFragment();
+
+        // Add two more networks and update framework bundle.
+        addOneSpecifiedNetworkConfig(mNewWpaConfigEntry);
+        addOneSpecifiedNetworkConfig(mNewOpenConfigEntry);
+        setUpBundle(mFakedSpecifiedNetworksList);
+        Bundle bundle = mAddAppNetworksFragment.getArguments();
+        mAddAppNetworksFragment.createContent(bundle);
+
+        // Ui list should contain 3 networks.
+        assertThat(mAddAppNetworksFragment.mUiToRequestedList).hasSize(3);
+    }
+
     private void addOneSavedNetworkConfig(@NonNull WifiConfiguration wifiConfiguration) {
         if (mFakeSavedNetworksList == null) {
             mFakeSavedNetworksList = new ArrayList<>();