Reland "Send FrameSwapMessageQueue's messages in QueueMessageSwapPromise" with fixes

content/renderer/gpu/frame_swap_message_queue.cc

Index: content/renderer/gpu/frame_swap_message_queue.cc
diff --git a/content/renderer/gpu/frame_swap_message_queue.cc b/content/renderer/gpu/frame_swap_message_queue.cc
index cf3107b81b67990e415741ffd383bfe8fced1bf9..3f43b95dead19fb5c115851aca3b008bca787353 100644
--- a/content/renderer/gpu/frame_swap_message_queue.cc
+++ b/content/renderer/gpu/frame_swap_message_queue.cc
@@ -112,9 +112,11 @@ class SwapQueue : public FrameSwapMessageSubQueue {
 
 }  // namespace
 
-FrameSwapMessageQueue::FrameSwapMessageQueue()
+FrameSwapMessageQueue::FrameSwapMessageQueue(int32_t routing_id)
     : visual_state_queue_(new VisualStateQueue()),
-      swap_queue_(new SwapQueue()) {
+      swap_queue_(new SwapQueue()),
+      routing_id_(routing_id) {
+  DETACH_FROM_THREAD(impl_thread_checker_);
 }
 
 FrameSwapMessageQueue::~FrameSwapMessageQueue() {
@@ -210,4 +212,15 @@ uint32_t FrameSwapMessageQueue::AllocateFrameToken() {
   return ++last_used_frame_token_;
 }
 
+void FrameSwapMessageQueue::NotifyFramesAreDiscarded(
+    bool frames_are_discarded) {
+  DCHECK_CALLED_ON_VALID_THREAD(impl_thread_checker_);
+  frames_are_discarded_ = frames_are_discarded;
+}
+
+bool FrameSwapMessageQueue::AreFramesDiscarded() {
+  DCHECK_CALLED_ON_VALID_THREAD(impl_thread_checker_);
+  return frames_are_discarded_;
+}
+
 }  // namespace content