Remove access to WebContents in RWHVA::SynchronousFrameMetadata()

content/browser/devtools/render_frame_devtools_agent_host.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/devtools/render_frame_devtools_agent_host.h"
 
 #include <tuple>
 #include <utility>
 
 #include "base/guid.h"
@@ skipping 1034 matching lines @@
     page_handler_->OnSwapCompositorFrame(
         std::move(std::get<1>(param).metadata));
   if (input_handler_)
     input_handler_->OnSwapCompositorFrame(std::get<1>(param).metadata);
   if (frame_trace_recorder_ && tracing_handler_->did_initiate_recording()) {
     frame_trace_recorder_->OnSwapCompositorFrame(
         current_ ? current_->host() : nullptr, std::get<1>(param).metadata);
   }
 }
 
+void RenderFrameDevToolsAgentHost::SignalSynchronousSwapCompositorFrame(
+    RenderFrameHost* frame_host,
+    cc::CompositorFrameMetadata frame_metadata) {
+  scoped_refptr<RenderFrameDevToolsAgentHost> dtah(FindAgentHost(frame_host));
+  if (dtah) {
+    // Unblock the compositor.
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(
+            &RenderFrameDevToolsAgentHost::SynchronousSwapCompositorFrame,
+            dtah.get(),
+            base::Passed(std::move(frame_metadata))));
+  }
+}
+
 void RenderFrameDevToolsAgentHost::SynchronousSwapCompositorFrame(
     cc::CompositorFrameMetadata frame_metadata) {
   if (page_handler_)
     page_handler_->OnSynchronousSwapCompositorFrame(std::move(frame_metadata));
   if (input_handler_)
     input_handler_->OnSwapCompositorFrame(frame_metadata);
   if (frame_trace_recorder_ && tracing_handler_->did_initiate_recording()) {
     frame_trace_recorder_->OnSynchronousSwapCompositorFrame(
         current_ ? current_->host() : nullptr,
         frame_metadata);
@@ skipping 36 matching lines @@
     RenderFrameHost* host) {
   return (current_ && current_->host() == host) ||
       (pending_ && pending_->host() == host);
 }
 
 bool RenderFrameDevToolsAgentHost::IsChildFrame() {
   return current_ && current_->host()->GetParent();
 }
 
 }  // namespace content