Implement webview.captureVisibleRegion()

content/browser/frame_host/render_widget_host_view_guest.cc

 // Copyright 2014 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.
 
 #include "content/browser/frame_host/render_widget_host_view_guest.h"
 
 #include <utility>
 
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
@@ skipping 282 matching lines @@
   }
 
   cc::SurfaceFactory::DrawCallback ack_callback = base::Bind(
       &RenderWidgetHostViewChildFrame::SurfaceDrawn,
       RenderWidgetHostViewChildFrame::AsWeakPtr(), output_surface_id);
   ack_pending_count_++;
   // If this value grows very large, something is going wrong.
   DCHECK(ack_pending_count_ < 1000);
   surface_factory_->SubmitCompositorFrame(surface_id_, std::move(frame),
                                           ack_callback);
+
+  ProcessFrameSwappedCallbacks();
 }
 
 bool RenderWidgetHostViewGuest::OnMessageReceived(const IPC::Message& msg) {
   if (!platform_view_) {
     // In theory, we can get here if there's a delay between DestroyGuestView()
     // being called and when our destructor is invoked.
     return false;
   }
 
   return platform_view_->OnMessageReceived(msg);
@@ skipping 392 matching lines @@
     if (gesture_event.type == blink::WebInputEvent::GestureScrollUpdate &&
         gesture_event.data.scrollUpdate.inertial) {
       return;
     }
     host_->ForwardGestureEvent(gesture_event);
     return;
   }
 }
 
 }  // namespace content