Gamepad: add test support for page visibility behavior

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 8934a31febddd5bed83954f877035734b69fc865..6e124b321bd57e00648a24a0f89601475a47487a 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -405,9 +405,6 @@ void RenderThreadImpl::Init() {
 
   AddFilter((new EmbeddedWorkerContextMessageFilter())->GetFilter());
 
-  gamepad_shared_memory_reader_.reset(new GamepadSharedMemoryReader());
-  AddObserver(gamepad_shared_memory_reader_.get());
-
   GetContentClient()->renderer()->RenderThreadStarted();
 
   InitSkiaEventTracer();
@@ -792,6 +789,10 @@ void RenderThreadImpl::EnsureWebKitInitialized() {
       CompositorOutputSurface::CreateFilter(output_surface_loop.get());
   AddFilter(compositor_output_surface_filter_.get());
 
+  gamepad_shared_memory_reader_.reset(
+      new GamepadSharedMemoryReader(webkit_platform_support_.get()));
+  AddObserver(gamepad_shared_memory_reader_.get());
+
   RenderThreadImpl::RegisterSchemes();
 
   EnableBlinkPlatformLogChannels(