Move bindToCurrentThread out to the creators of WebGL contexts.

components/test_runner/test_plugin.cc

Index: components/test_runner/test_plugin.cc
diff --git a/components/test_runner/test_plugin.cc b/components/test_runner/test_plugin.cc
index e8793fd4ec9f9a616adc3a404a05f297d5db8748..4753782cdd638b4471b1729a22a6ac9507d94fcb 100644
--- a/components/test_runner/test_plugin.cc
+++ b/components/test_runner/test_plugin.cc
@@ -185,7 +185,9 @@ bool TestPlugin::initialize(blink::WebPluginContainer* container) {
   blink::Platform::GraphicsInfo gl_info;
   context_provider_ = base::WrapUnique(
       blink::Platform::current()->createOffscreenGraphicsContext3DProvider(
-          attrs, url, nullptr, &gl_info, blink::Platform::BindToCurrentThread));
+          attrs, url, nullptr, &gl_info));
+  if (!context_provider_->bindToCurrentThread())
+    context_provider_ = nullptr;
   gl_ = context_provider_ ? context_provider_->contextGL() : nullptr;
 
   if (!InitScene())