Adding install reason when installing an apk

Since the installation involves a user visible UI, set the
appropriate reason. This ensures that the app icon is added
on the homescreen.

Test: Installed an apk using the files app
Bug: 65473379
Change-Id: I5032e31fc7615a63c2630687bc81e663f2286d59

packages/PackageInstaller/src/com/android/packageinstaller/InstallInstalling.java

@@ -137,6 +137,7 @@ public class InstallInstalling extends AlertActivity {
                         UID_UNKNOWN);
                 params.installerPackageName =
                         getIntent().getStringExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME);
+                params.installReason = PackageManager.INSTALL_REASON_USER;
 
                 File file = new File(mPackageURI.getPath());
                 try {