Add PluginMessageLoopProxy and use it for Host plugin UI thread.

remoting/host/chromoting_host_context.cc

Index: remoting/host/chromoting_host_context.cc
diff --git a/remoting/host/chromoting_host_context.cc b/remoting/host/chromoting_host_context.cc
index de99a1f0f5fe17f7c336702a8492cbca41443466..c90f5b0304dad1cd8c001f38ded8aa7826f19d83 100644
--- a/remoting/host/chromoting_host_context.cc
+++ b/remoting/host/chromoting_host_context.cc
@@ -7,15 +7,27 @@
 #include <string>
 
 #include "base/bind.h"
+#include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "remoting/jingle_glue/jingle_thread.h"
 
 namespace remoting {
 
-ChromotingHostContext::ChromotingHostContext()
+namespace {
+void InitializeMessageLoopProxy(
+    scoped_refptr<base::MessageLoopProxy>* proxy,
+    base::WaitableEvent* done) {
+  *proxy = base::MessageLoopProxy::CreateForCurrentThread();
+  done->Signal();
+}
+}  // namespace
+
+ChromotingHostContext::ChromotingHostContext(
+    base::MessageLoopProxy* ui_message_loop)
     : main_thread_("ChromotingMainThread"),
       encode_thread_("ChromotingEncodeThread"),
-      desktop_thread_("ChromotingDesktopThread") {
+      desktop_thread_("ChromotingDesktopThread"),
+      ui_message_loop_(ui_message_loop) {
 }
 
 ChromotingHostContext::~ChromotingHostContext() {
@@ -27,6 +39,12 @@ void ChromotingHostContext::Start() {
   encode_thread_.Start();
   jingle_thread_.Start();
   desktop_thread_.Start();
+
+  // Initialize |network_message_loop_| on the network thread.
+  base::WaitableEvent proxy_event(true, false);
+  jingle_thread_.message_loop()->PostTask(FROM_HERE, base::Bind(
+      &InitializeMessageLoopProxy, &network_message_loop_, &proxy_event));
+  proxy_event.Wait();
 }
 
 void ChromotingHostContext::Stop() {
@@ -41,6 +59,10 @@ JingleThread* ChromotingHostContext::jingle_thread() {
   return &jingle_thread_;
 }
 
+base::MessageLoopProxy* ChromotingHostContext::ui_message_loop() {
+  return ui_message_loop_;
+}
+
 MessageLoop* ChromotingHostContext::main_message_loop() {
   return main_thread_.message_loop();
 }
@@ -50,38 +72,11 @@ MessageLoop* ChromotingHostContext::encode_message_loop() {
 }
 
 base::MessageLoopProxy* ChromotingHostContext::network_message_loop() {
-  return jingle_thread_.message_loop_proxy();
+  return network_message_loop_;
 }
 
 MessageLoop* ChromotingHostContext::desktop_message_loop() {
   return desktop_thread_.message_loop();
 }
 
-void ChromotingHostContext::SetUITaskPostFunction(
-    const UIThreadPostTaskFunction& poster) {
-  ui_poster_ = poster;
-  ui_main_thread_id_ = base::PlatformThread::CurrentId();
-}
-
-void ChromotingHostContext::PostTaskToUIThread(
-    const tracked_objects::Location& from_here, const base::Closure& task) {
-  ui_poster_.Run(from_here, task);
-}
-
-void ChromotingHostContext::PostDelayedTaskToUIThread(
-    const tracked_objects::Location& from_here,
-    const base::Closure& task,
-    int delay_ms) {
-  // Post delayed task on the main thread that will post task on UI
-  // thread. It is safe to use base::Unretained() here because
-  // ChromotingHostContext owns |main_thread_|.
-  main_message_loop()->PostDelayedTask(from_here, base::Bind(
-      &ChromotingHostContext::PostTaskToUIThread, base::Unretained(this),
-      from_here, task), delay_ms);
-}
-
-bool ChromotingHostContext::IsUIThread() const {
-  return ui_main_thread_id_ == base::PlatformThread::CurrentId();
-}
-
 }  // namespace remoting