Mojo C++ bindings: more consistent Clone() and Equals().

mojo/public/cpp/bindings/associated_interface_request.h

Index: mojo/public/cpp/bindings/associated_interface_request.h
diff --git a/mojo/public/cpp/bindings/associated_interface_request.h b/mojo/public/cpp/bindings/associated_interface_request.h
index a7a7f662166b7e2111a626760b82fcbcaa54270c..dc437bb5e025e7401dde9270a1a7b87593343e0e 100644
--- a/mojo/public/cpp/bindings/associated_interface_request.h
+++ b/mojo/public/cpp/bindings/associated_interface_request.h
@@ -57,6 +57,15 @@ class AssociatedInterfaceRequest {
 
   const ScopedInterfaceEndpointHandle& handle() const { return handle_; }
 
+  bool Equals(const AssociatedInterfaceRequest& other) const {
+    if (this == &other)
+      return true;
+
+    // Now that the two refer to different objects, they are equivalent if
+    // and only if they are both invalid.
+    return !is_pending() && !other.is_pending();
+  }
+
  private:
   ScopedInterfaceEndpointHandle handle_;
 };