[Remoting Android] JniGlDisplayHandler calls invalidate() on UI thread

remoting/client/jni/jni_gl_display_handler.h

Index: remoting/client/jni/jni_gl_display_handler.h
diff --git a/remoting/client/jni/jni_gl_display_handler.h b/remoting/client/jni/jni_gl_display_handler.h
index 5380a0725025c68fddb2b117290318555f0df036..2346c32b66f02b38786d0ad56ef619f57a2ebf4c 100644
--- a/remoting/client/jni/jni_gl_display_handler.h
+++ b/remoting/client/jni/jni_gl_display_handler.h
@@ -33,7 +33,6 @@ class JniGlDisplayHandler : public DisplayUpdaterFactory,
                             public GlRendererDelegate {
  public:
   JniGlDisplayHandler(ChromotingJniRuntime* runtime);
-  ~JniGlDisplayHandler() override;
 
   // Sets the DesktopViewFactory for the Java client.
   void InitializeClient(
@@ -43,6 +42,9 @@ class JniGlDisplayHandler : public DisplayUpdaterFactory,
   std::unique_ptr<protocol::CursorShapeStub> CreateCursorShapeStub() override;
   std::unique_ptr<protocol::VideoRenderer> CreateVideoRenderer() override;
 
+  //  Must be called on the UI thread.
+  void Destroy() override;
+
   static bool RegisterJni(JNIEnv* env);
 
   void OnSurfaceCreated(
@@ -84,6 +86,11 @@ class JniGlDisplayHandler : public DisplayUpdaterFactory,
       float diameter);
 
  private:
+  ~JniGlDisplayHandler() override;
+
+  // This avoids listing DeleteHelper as friend.
+  void DeleteOnDisplayThread();
+
   // GlRendererDelegate interface.
   bool CanRenderFrame() override;
   void OnFrameRendered() override;