Add RenderThread::GetShutdownEvent().

This change adds RenderThread::GetShutdownEvent() to the public content API.
This is required for code outside of content/ that wants to safely use
interfaces like SyncChannel.

BUG=

Review URL: https://codereview.chromium.org/186973002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255275 0039d316-1c4b-4281-b951-d872f2087c98

components/nacl/renderer/ppb_nacl_private_impl.cc

@@ -77,8 +77,6 @@ typedef std::map<PP_Instance, nacl::TrustedPluginChannel*>
 base::LazyInstance<InstanceTrustedChannelMap> g_channel_map =
     LAZY_INSTANCE_INITIALIZER;
 
-base::WaitableEvent* g_shutdown_event;
-
 void HistogramEnumerate(const std::string& name,
                         int32_t sample,
                         int32_t boundary_value) {
@@ -195,10 +193,9 @@ void LaunchSelLdr(PP_Instance instance,
     invalid_handle = (launch_result.trusted_ipc_channel_handle.socket.fd == -1);
 #endif
   if (!invalid_handle) {
-    if (g_shutdown_event == NULL)
-      g_shutdown_event = new base::WaitableEvent(true, false);
     g_channel_map.Get()[instance] = new nacl::TrustedPluginChannel(
-        launch_result.trusted_ipc_channel_handle, callback, g_shutdown_event);
+        launch_result.trusted_ipc_channel_handle, callback,
+        content::RenderThread::Get()->GetShutdownEvent());
   }
 
   *(static_cast<NaClHandle*>(imc_handle)) =

content/public/renderer/render_thread.h

@@ -22,6 +22,7 @@ class GURL;
 namespace base {
 class MessageLoop;
 class MessageLoopProxy;
+class WaitableEvent;
 }
 
 namespace IPC {
@@ -121,6 +122,9 @@ class CONTENT_EXPORT RenderThread : public IPC::Sender {
   // proxy servers.
   virtual bool ResolveProxy(const GURL& url, std::string* proxy_list) = 0;
 
+  // Gets the shutdown event for the process.
+  virtual base::WaitableEvent* GetShutdownEvent() = 0;
+
 #if defined(OS_WIN)
   // Request that the given font be loaded by the browser so it's cached by the
   // OS. Please see ChildProcessHost::PreCacheFont for details.

content/public/test/mock_render_thread.cc

@@ -185,6 +185,10 @@ bool MockRenderThread::ResolveProxy(const GURL& url, std::string* proxy_list) {
   return false;
 }
 
+base::WaitableEvent* MockRenderThread::GetShutdownEvent() {
+  return NULL;
+}
+
 #if defined(OS_WIN)
 void MockRenderThread::PreCacheFont(const LOGFONT& log_font) {
 }

content/public/test/mock_render_thread.h

@@ -69,6 +69,7 @@ class MockRenderThread : public RenderThread {
   virtual void UpdateHistograms(int sequence_number) OVERRIDE;
   virtual int PostTaskToAllWebWorkers(const base::Closure& closure) OVERRIDE;
   virtual bool ResolveProxy(const GURL& url, std::string* proxy_list) OVERRIDE;
+  virtual base::WaitableEvent* GetShutdownEvent() OVERRIDE;
 #if defined(OS_WIN)
   virtual void PreCacheFont(const LOGFONT& log_font) OVERRIDE;
   virtual void ReleaseCachedFonts() OVERRIDE;

content/renderer/render_thread_impl.cc

@@ -1023,6 +1023,10 @@ media::AudioHardwareConfig* RenderThreadImpl::GetAudioHardwareConfig() {
   return audio_hardware_config_.get();
 }
 
+base::WaitableEvent* RenderThreadImpl::GetShutdownEvent() {
+  return ChildProcess::current()->GetShutDownEvent();
+}
+
 #if defined(OS_WIN)
 void RenderThreadImpl::PreCacheFontCharacters(const LOGFONT& log_font,
                                               const base::string16& str) {

content/renderer/render_thread_impl.h

@@ -151,6 +151,7 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
   virtual void UpdateHistograms(int sequence_number) OVERRIDE;
   virtual int PostTaskToAllWebWorkers(const base::Closure& closure) OVERRIDE;
   virtual bool ResolveProxy(const GURL& url, std::string* proxy_list) OVERRIDE;
+  virtual base::WaitableEvent* GetShutdownEvent() OVERRIDE;
 #if defined(OS_WIN)
   virtual void PreCacheFont(const LOGFONT& log_font) OVERRIDE;
   virtual void ReleaseCachedFonts() OVERRIDE;