Send input event IPCs directly from the UI thread

ipc/ipc_channel_proxy.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 "ipc/ipc_channel_proxy.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
@@ skipping 300 matching lines @@
 void ChannelProxy::Context::OnDispatchBadMessage(const Message& message) {
   if (listener_)
     listener_->OnBadMessageReceived(message);
 }
 
 void ChannelProxy::Context::ClearChannel() {
   base::AutoLock l(channel_lifetime_lock_);
   channel_.reset();
 }
 
-void ChannelProxy::Context::SendFromThisThread(Message* message) {
+bool ChannelProxy::Context::SendFromThisThread(Message* message) {
   base::AutoLock l(channel_lifetime_lock_);
   if (!channel_)
-    return;
+    return false;
   DCHECK(channel_->IsSendThreadSafe());
-  channel_->Send(message);
+  return channel_->Send(message);
 }
 
-void ChannelProxy::Context::Send(Message* message) {
-  if (channel_send_thread_safe_) {
-    SendFromThisThread(message);
-    return;
-  }
+bool ChannelProxy::Context::Send(Message* message, bool force_io_thread) {
+  if (channel_send_thread_safe_ && !force_io_thread)
+    return SendFromThisThread(message);
 
   ipc_task_runner()->PostTask(
       FROM_HERE, base::Bind(&ChannelProxy::Context::OnSendMessage, this,
                             base::Passed(base::WrapUnique(message))));
+  return true;
 }
 
 bool ChannelProxy::Context::IsChannelSendThreadSafe() const {
   return channel_send_thread_safe_;
 }
 
 //-----------------------------------------------------------------------------
 
 // static
 std::unique_ptr<ChannelProxy> ChannelProxy::Create(
@@ skipping 22 matching lines @@
     : context_(context),
       did_init_(false) {
 #if defined(ENABLE_IPC_FUZZER)
   outgoing_message_filter_ = NULL;
 #endif
 }
 
 ChannelProxy::ChannelProxy(
     Listener* listener,
     const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner)
-    : context_(new Context(listener, ipc_task_runner)), did_init_(false) {
-#if defined(ENABLE_IPC_FUZZER)
-  outgoing_message_filter_ = NULL;
-#endif
-}
+    : ChannelProxy(new Context(listener, ipc_task_runner)) {}
 
 ChannelProxy::~ChannelProxy() {
   DCHECK(CalledOnValidThread());
 
   Close();
 }
 
 void ChannelProxy::Init(const IPC::ChannelHandle& channel_handle,
                         Channel::Mode mode,
                         bool create_pipe_now) {
@@ skipping 42 matching lines @@
   // possible that the channel could be closed while it is receiving messages!
   context_->Clear();
 
   if (context_->ipc_task_runner()) {
     context_->ipc_task_runner()->PostTask(
         FROM_HERE, base::Bind(&Context::OnChannelClosed, context_.get()));
   }
 }
 
 bool ChannelProxy::Send(Message* message) {
-  DCHECK(did_init_);
+  return SendOnIPCThread(message);
+}
 
-  // TODO(alexeypa): add DCHECK(CalledOnValidThread()) here. Currently there are
-  // tests that call Send() from a wrong thread. See http://crbug.com/163523.
+bool ChannelProxy::SendNow(Message* message) {
+  return SendImpl(message, false /* force_io_thread */);
+}
 
-#ifdef ENABLE_IPC_FUZZER
-  // In IPC fuzzing builds, it is possible to define a filter to apply to
-  // outgoing messages. It will either rewrite the message and return a new
-  // one, freeing the original, or return the message unchanged.
-  if (outgoing_message_filter())
-    message = outgoing_message_filter()->Rewrite(message);
-#endif
-
-#ifdef IPC_MESSAGE_LOG_ENABLED
-  Logging::GetInstance()->OnSendMessage(message, context_->channel_id());
-#endif
-
-  context_->Send(message);
-  return true;
+bool ChannelProxy::SendOnIPCThread(Message* message) {
+  return SendImpl(message, true /* force_io_thread */);
 }
 
 void ChannelProxy::AddFilter(MessageFilter* filter) {
   DCHECK(CalledOnValidThread());
 
   context_->AddFilter(filter);
 }
 
 void ChannelProxy::RemoveFilter(MessageFilter* filter) {
   DCHECK(CalledOnValidThread());
@@ skipping 36 matching lines @@
   Channel* channel = context_.get()->channel_.get();
   // Channel must have been created first.
   DCHECK(channel) << context_.get()->channel_id_;
   return channel->TakeClientFileDescriptor();
 }
 #endif
 
 void ChannelProxy::OnChannelInit() {
 }
 
+bool ChannelProxy::SendImpl(Message* message, bool force_io_thread) {
+  DCHECK(did_init_);
+
+  // TODO(alexeypa): add DCHECK(CalledOnValidThread()) here. Currently there are
+  // tests that call Send() from a wrong thread. See http://crbug.com/163523.
+
+#ifdef ENABLE_IPC_FUZZER
+  // In IPC fuzzing builds, it is possible to define a filter to apply to
+  // outgoing messages. It will either rewrite the message and return a new
+  // one, freeing the original, or return the message unchanged.
+  if (outgoing_message_filter())
+    message = outgoing_message_filter()->Rewrite(message);
+#endif
+
+#ifdef IPC_MESSAGE_LOG_ENABLED
+  Logging::GetInstance()->OnSendMessage(message, context_->channel_id());
+#endif
+
+  return context_->Send(message, force_io_thread);
+}
+
 //-----------------------------------------------------------------------------
 
 }  // namespace IPC