Update mojo sdk to rev 91d94d6993c9b0c4135a95687a7d541ce90629b

mojo/public/cpp/environment/environment.h

Index: mojo/public/cpp/environment/environment.h
diff --git a/mojo/public/cpp/environment/environment.h b/mojo/public/cpp/environment/environment.h
index 48f4c26eb724cf824e34ab89af3b351ceda590ad..ce3f7d01ad96b42e0ed6647b778ea1e108f18f68 100644
--- a/mojo/public/cpp/environment/environment.h
+++ b/mojo/public/cpp/environment/environment.h
@@ -32,6 +32,14 @@ class Environment {
   static const MojoAsyncWaiter* GetDefaultAsyncWaiter();
   static const MojoLogger* GetDefaultLogger();
 
+  // These instantiate and destroy an environment-specific run loop for the
+  // current thread, allowing |GetDefaultAsyncWaiter()| to be used. (The run
+  // loop itself should be accessible via thread-local storage, using methods
+  // specific to the run loop implementation.) Creating and destroying nested
+  // run loops is not supported.
+  static void InstantiateDefaultRunLoop();
+  static void DestroyDefaultRunLoop();
+
  private:
   MOJO_DISALLOW_COPY_AND_ASSIGN(Environment);
 };