Fix test

Author: ColdPaleLight

testing/scenario_app/android/app/src/androidTest/java/dev/flutter/scenariosui/GetBitmapTests.java

@@ -33,6 +33,6 @@ public void getBitmap() throws Exception {
     Bitmap bitmap = activity.getBitmap();
 
     assertEquals(bitmap.getPixel(10, 10), 0xFFFF0000);
-    assertEquals(bitmap.getPixel(10, 10), 0xFF0000FF);
+    assertEquals(bitmap.getPixel(10, 210), 0xFF00FF00);
   }
 }

testing/scenario_app/android/app/src/main/java/dev/flutter/scenarios/GetBitmapActivity.java

@@ -9,9 +9,17 @@
 
 public class GetBitmapActivity extends TestActivity {
 
+  @Nullable private volatile Bitmap bitmap;
+
   @Nullable
   public Bitmap getBitmap() {
     waitUntilFlutterRendered();
-    return getFlutterEngine().getRenderer().getBitmap();
+    return bitmap;
+  }
+
+  @Nullable
+  protected void notifyFlutterRendered() {
+    bitmap = getFlutterEngine().getRenderer().getBitmap();
+    super.notifyFlutterRendered();
   }
 }