Revert of Mojo bindings environment: remove usage in gles2.

components/mus/public/cpp/lib/context_provider.cc

Index: components/mus/public/cpp/lib/context_provider.cc
diff --git a/components/mus/public/cpp/lib/context_provider.cc b/components/mus/public/cpp/lib/context_provider.cc
index 0b0b470a7c111c43ce3b3cbf8e5428726d76b448..d2d6ce012d22298629c102e93a8f48caee4c69da 100644
--- a/components/mus/public/cpp/lib/context_provider.cc
+++ b/components/mus/public/cpp/lib/context_provider.cc
@@ -9,6 +9,7 @@
 #include "base/logging.h"
 #include "mojo/gles2/gles2_context.h"
 #include "mojo/gpu/mojo_gles2_impl_autogen.h"
+#include "mojo/public/cpp/environment/environment.h"
 
 namespace mus {
 
@@ -24,7 +25,8 @@
 bool ContextProvider::BindToCurrentThread() {
   DCHECK(command_buffer_handle_.is_valid());
   context_ = MojoGLES2CreateContext(command_buffer_handle_.release().value(),
-                                    nullptr, &ContextLostThunk, this);
+                                    nullptr, &ContextLostThunk, this,
+                                    mojo::Environment::GetDefaultAsyncWaiter());
   context_gl_.reset(new mojo::MojoGLES2Impl(context_));
   return !!context_;
 }