Expose platform thread id on blink::WebThread

content/child/webthread_impl.cc

Index: content/child/webthread_impl.cc
diff --git a/content/child/webthread_impl.cc b/content/child/webthread_impl.cc
index d53d06e061036ba3a2c8fb99c5bcee800471eb24..1f3097a268214841e360392e51893009dd8b06d3 100644
--- a/content/child/webthread_impl.cc
+++ b/content/child/webthread_impl.cc
@@ -88,13 +88,18 @@ bool WebThreadImpl::isCurrentThread() const {
   return thread_->thread_id() == base::PlatformThread::CurrentId();
 }
 
+blink::PlatformThreadId WebThreadImpl::threadId() const {
+  return thread_->thread_id();
+}
+
 WebThreadImpl::~WebThreadImpl() {
   thread_->Stop();
 }
 
 WebThreadImplForMessageLoop::WebThreadImplForMessageLoop(
     base::MessageLoopProxy* message_loop)
-    : message_loop_(message_loop) {}
+    : message_loop_(message_loop),
+      thread_id_(base::PlatformThread::CurrentId()) {}
 
 void WebThreadImplForMessageLoop::postTask(Task* task) {
   message_loop_->PostTask(
@@ -126,6 +131,10 @@ bool WebThreadImplForMessageLoop::isCurrentThread() const {
   return message_loop_->BelongsToCurrentThread();
 }
 
+blink::PlatformThreadId WebThreadImplForMessageLoop::threadId() const {
+  return thread_id_;
+}
+
 WebThreadImplForMessageLoop::~WebThreadImplForMessageLoop() {}
 
 }  // namespace content