PR Updates: Added blank lines at end of files.

shell/platform/android/io/flutter/embedding/engine/FlutterEngine.java

@@ -39,4 +39,4 @@ public interface EngineLifecycleListener {
      */
     void onPreEngineRestart();
   }
-}
+}

shell/platform/android/io/flutter/embedding/engine/FlutterJNI.java

@@ -521,4 +521,4 @@ private void ensureAttachedToNative() {
       throw new RuntimeException("Cannot execute operation because FlutterJNI is not attached to native.");
     }
   }
-}
+}

shell/platform/android/io/flutter/embedding/engine/dart/PlatformMessageHandler.java

@@ -12,4 +12,4 @@ public interface PlatformMessageHandler {
   void handlePlatformMessage(final String channel, byte[] message, final int replyId);
 
   void handlePlatformMessageResponse(int replyId, byte[] reply);
-}
+}

shell/platform/android/io/flutter/embedding/engine/renderer/FlutterRenderer.java

@@ -265,4 +265,4 @@ public interface RenderSurface {
      */
     void onFirstFrameRendered();
   }
-}
+}

shell/platform/android/io/flutter/embedding/engine/renderer/OnFirstFrameRenderedListener.java

@@ -17,4 +17,4 @@ public interface OnFirstFrameRenderedListener {
    * This method will not be invoked if this listener is added after the first frame is rendered.
    */
   void onFirstFrameRendered();
-}
+}