Revert of Mojo bindings environment: remove usage in gles2.

mojo/gles2/gles2_context.h

Index: mojo/gles2/gles2_context.h
diff --git a/mojo/gles2/gles2_context.h b/mojo/gles2/gles2_context.h
index 684b48548a1336bcdbf16464d5a1198ae51077a9..ecb7af5277e13226ad4f695de4e2d5772a4ef192 100644
--- a/mojo/gles2/gles2_context.h
+++ b/mojo/gles2/gles2_context.h
@@ -31,6 +31,7 @@
                      public MojoGLES2ContextPrivate {
  public:
   explicit GLES2Context(const std::vector<int32_t>& attribs,
+                        const MojoAsyncWaiter* async_waiter,
                         mojo::ScopedMessagePipeHandle command_buffer_handle,
                         MojoGLES2ContextLost lost_callback,
                         void* closure);