Gamepad API: add support for connection events

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 08016d760e1858be4431575e2cf3e711ccbc583c..5e24d9bd0cfa520dde3876fa09ea5b2df98657ad 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -396,6 +396,9 @@ void RenderThreadImpl::Init() {
 
   AddFilter((new EmbeddedWorkerContextMessageFilter())->GetFilter());
 
+  gamepad_shared_memory_reader_.reset(new GamepadSharedMemoryReader());
+  AddObserver(gamepad_shared_memory_reader_.get());
+
   GetContentClient()->renderer()->RenderThreadStarted();
 
   InitSkiaEventTracer();
@@ -1458,11 +1461,13 @@ void RenderThreadImpl::SetFlingCurveParameters(
 }
 
 void RenderThreadImpl::SampleGamepads(blink::WebGamepads* data) {
-  if (!gamepad_shared_memory_reader_)
-    gamepad_shared_memory_reader_.reset(new GamepadSharedMemoryReader);
   gamepad_shared_memory_reader_->SampleGamepads(*data);
 }
 
+void RenderThreadImpl::SetGamepadListener(blink::WebGamepadListener* listener) {
+  gamepad_shared_memory_reader_->SetGamepadListener(listener);
+}
+
 void RenderThreadImpl::WidgetCreated() {
   widget_count_++;
 }