On negative user action, cancel the install

Send an aborted message to the caller and set appropriate activity result code.

Bug: 182205982
Test: builds successfully
Test: No CTS Tests. Flag to use new app is turned off by default

Change-Id: Ib92caadd2ffb7d13b282c355db45b06f67796a77

packages/PackageInstaller/src/com/android/packageinstaller/v2/model/UninstallRepository.java

@@ -682,6 +682,13 @@ public class UninstallRepository {
         }
     }
 
+    public void cancelInstall() {
+        if (mCallback != null) {
+            mCallback.onUninstallComplete(mTargetPackageName,
+                PackageManager.DELETE_FAILED_ABORTED, "Cancelled by user");
+        }
+    }
+
     public MutableLiveData<UninstallStage> getUninstallResult() {
         return mUninstallResult;
     }

packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/UninstallLaunch.java

@@ -161,6 +161,7 @@ public class UninstallLaunch extends FragmentActivity implements UninstallAction
 
     @Override
     public void onNegativeResponse() {
+        mUninstallViewModel.cancelInstall();
         setResult(Activity.RESULT_FIRST_USER, null, true);
     }
 }

packages/PackageInstaller/src/com/android/packageinstaller/v2/viewmodel/UninstallViewModel.java

@@ -62,4 +62,8 @@ public class UninstallViewModel extends AndroidViewModel {
             }
         });
     }
+
+    public void cancelInstall() {
+        mRepository.cancelInstall();
+    }
 }