Reject CompositorFrames with no render passes when deserializing

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 2012 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/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 
 #include <set>
 #include <tuple>
@@ skipping 2613 matching lines @@
   renderer_compositor_frame_sink_ = std::move(client);
 }
 
 void RenderWidgetHostImpl::SetNeedsBeginFrame(bool needs_begin_frame) {
   OnSetNeedsBeginFrames(needs_begin_frame);
 }
 
 void RenderWidgetHostImpl::SubmitCompositorFrame(
     const cc::LocalSurfaceId& local_surface_id,
     cc::CompositorFrame frame) {
-  // The renderer should not send empty frames.
-  if (frame.render_pass_list.empty()) {
-    DLOG(ERROR) << "Renderer sent an empty frame.";
-    return;
-  }
-
   // The renderer must allocate a new LocalSurfaceId if frame size or device
   // scale factor changes.
   float device_scale_factor = frame.metadata.device_scale_factor;
   const gfx::Size& frame_size =
       frame.render_pass_list.back()->output_rect.size();
   if (local_surface_id == last_local_surface_id_ &&
       (frame_size != last_frame_size_ ||
        device_scale_factor != last_device_scale_factor_)) {
     DLOG(ERROR) << "Renderer submitted frame of wrong size to its surface."
                 << " Expected: size=" << last_frame_size_.ToString()
@@ skipping 87 matching lines @@
   RenderProcessHost* rph = GetProcess();
   for (std::vector<IPC::Message>::const_iterator i = messages.begin();
        i != messages.end(); ++i) {
     rph->OnMessageReceived(*i);
     if (i->dispatch_error())
       rph->OnBadMessageReceived(*i);
   }
 }
 
 }  // namespace content