[CRD iOS] Viewport fling animation

remoting/ios/display/gl_display_handler.mm

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #include <array>
 
@@ skipping 131 matching lines @@
 }
 
 void Core::OnFrameReceived(std::unique_ptr<webrtc::DesktopFrame> frame,
                            const base::Closure& done) {
   DCHECK(runtime_->display_task_runner()->BelongsToCurrentThread());
   renderer_->OnFrameReceived(std::move(frame), done);
 }
 
 void Core::OnFrameRendered() {
   [eagl_context_ presentRenderbuffer:GL_RENDERBUFFER];
+  runtime_->ui_task_runner()->PostTask(FROM_HERE, base::BindBlockArc(^() {
+                                         [handler_delegate_ rendererTicked];
+                                       }));
 }
 
 void Core::OnSizeChanged(int width, int height) {
   DCHECK(runtime_->display_task_runner()->BelongsToCurrentThread());
   runtime_->ui_task_runner()->PostTask(
       FROM_HERE, base::BindBlockArc(^() {
         [handler_delegate_ canvasSizeChanged:CGSizeMake(width, height)];
       }));
 }
 
@@ skipping 115 matching lines @@
                  _core->GetWeakPtr(), delegate));
 }
 
 - (id<GlDisplayHandlerDelegate>)delegate {
   // Implementation is still required for UNAVAILABLE_ATTRIBUTE.
   NOTREACHED();
   return nil;
 }
 
 @end