Add autofill save for iOS and Android

shell/platform/android/io/flutter/embedding/engine/systemchannels/TextInputChannel.java

@@ -112,6 +112,10 @@ public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result
               textInputMethodHandler.clearClient();
               result.success(null);
               break;
+            case "TextInput.finishAutofillContext":
+              textInputMethodHandler.finishAutofillContext((boolean) args);
+              result.success(null);
+              break;
             default:
               result.notImplemented();
               break;
@@ -284,6 +288,18 @@ public interface TextInputMethodHandler {
      */
     void requestAutofill();
 
+    /**
+     * Requests that the {@link AutofillManager} cancel or commit the current autofill context.
+     *
+     * <p>The method calls {@link android.view.autofill.AutofillManager#commit()} when {@code
+     * shouldSave} is true, and calls {@link android.view.autofill.AutofillManager#cancel()}
+     * otherwise.
+     *
+     * @param shouldSave whether the active autofill service should save the current user input for
+     *     future use.
+     */
+    void finishAutofillContext(boolean shouldSave);
+
     // TODO(mattcarroll): javadoc
     void setClient(int textInputClientId, @NonNull Configuration configuration);
 

shell/platform/android/io/flutter/plugin/editing/TextInputPlugin.java

@@ -82,6 +82,18 @@ public void requestAutofill() {
             notifyViewEntered();
           }
 
+          @Override
+          public void finishAutofillContext(boolean shouldSave) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O || afm == null) {
+              return;
+            }
+            if (shouldSave) {
+              afm.commit();
+            } else {
+              afm.cancel();
+            }
+          }
+
           @Override
           public void setClient(
               int textInputClientId, TextInputChannel.Configuration configuration) {

shell/platform/android/test/io/flutter/plugin/editing/TextInputPluginTest.java

@@ -70,6 +70,14 @@ private void verifyMethodCall(ByteBuffer buffer, String methodName, String[] exp
     }
   }
 
+  private static void sendToBinaryMessageHandler(
+      BinaryMessenger.BinaryMessageHandler binaryMessageHandler, String method, Object args) {
+    MethodCall methodCall = new MethodCall(method, args);
+    ByteBuffer encodedMethodCall = JSONMethodCodec.INSTANCE.encodeMethodCall(methodCall);
+    binaryMessageHandler.onMessage(
+        (ByteBuffer) encodedMethodCall.flip(), mock(BinaryMessenger.BinaryReply.class));
+  }
+
   @Test
   public void textInputPlugin_RequestsReattachOnCreation() throws JSONException {
     // Initialize a general TextInputPlugin.
@@ -531,6 +539,33 @@ public void autofill_onProvideVirtualViewStructure_single() {
     verify(children[0]).setDimens(anyInt(), anyInt(), anyInt(), anyInt(), geq(0), geq(0));
   }
 
+  @Test
+  public void respondsToInputChannelMessages() {
+    ArgumentCaptor<BinaryMessenger.BinaryMessageHandler> binaryMessageHandlerCaptor =
+        ArgumentCaptor.forClass(BinaryMessenger.BinaryMessageHandler.class);
+    DartExecutor mockBinaryMessenger = mock(DartExecutor.class);
+    TextInputChannel.TextInputMethodHandler mockHandler =
+        mock(TextInputChannel.TextInputMethodHandler.class);
+    TextInputChannel textInputChannel = new TextInputChannel(mockBinaryMessenger);
+
+    textInputChannel.setTextInputMethodHandler(mockHandler);
+
+    verify(mockBinaryMessenger, times(1))
+        .setMessageHandler(any(String.class), binaryMessageHandlerCaptor.capture());
+
+    BinaryMessenger.BinaryMessageHandler binaryMessageHandler =
+        binaryMessageHandlerCaptor.getValue();
+
+    sendToBinaryMessageHandler(binaryMessageHandler, "TextInput.requestAutofill", null);
+    verify(mockHandler, times(1)).requestAutofill();
+
+    sendToBinaryMessageHandler(binaryMessageHandler, "TextInput.finishAutofillContext", true);
+    verify(mockHandler, times(1)).finishAutofillContext(true);
+
+    sendToBinaryMessageHandler(binaryMessageHandler, "TextInput.finishAutofillContext", false);
+    verify(mockHandler, times(1)).finishAutofillContext(false);
+  }
+
   @Implements(InputMethodManager.class)
   public static class TestImm extends ShadowInputMethodManager {
     private InputMethodSubtype currentInputMethodSubtype;