Expose platform thread id on blink::WebThread

mojo/services/html_viewer/webthread_impl.cc

Index: mojo/services/html_viewer/webthread_impl.cc
diff --git a/mojo/services/html_viewer/webthread_impl.cc b/mojo/services/html_viewer/webthread_impl.cc
index ee8153719fd6c017b3787191219e40ad50de2279..ae108e416d78ff01cd375ca8b6e5cbd4f58ce8f2 100644
--- a/mojo/services/html_viewer/webthread_impl.cc
+++ b/mojo/services/html_viewer/webthread_impl.cc
@@ -88,6 +88,10 @@ bool WebThreadImpl::isCurrentThread() const {
   return thread_->thread_id() == base::PlatformThread::CurrentId();
 }
 
+blink::PlatformThreadId WebThreadImpl::threadId() const {
+  return thread_->thread_id();
+}
+
 WebThreadImpl::~WebThreadImpl() {
   thread_->Stop();
 }
@@ -126,6 +130,10 @@ bool WebThreadImplForMessageLoop::isCurrentThread() const {
   return message_loop_->BelongsToCurrentThread();
 }
 
+blink::PlatformThreadId WebThreadImplForMessageLoop::threadId() const {
+  return thread_id_;
+}
+
 WebThreadImplForMessageLoop::~WebThreadImplForMessageLoop() {}
 
 }  // namespace mojo