Implement robust GetRenderbufferParameteriv entry points.

BUG=angleproject:1354

Change-Id: I073b75d416bd5184402b580bcebfca34f7cd28a8
Reviewed-on: https://chromium-review.googlesource.com/395110
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/src/libANGLE/queryutils.h b/src/libANGLE/queryutils.h
index 2ca4d66..1d883ad 100644
--- a/src/libANGLE/queryutils.h
+++ b/src/libANGLE/queryutils.h
@@ -17,6 +17,7 @@
 class Buffer;
 class Framebuffer;
 class Program;
+class Renderbuffer;
 
 void QueryFramebufferAttachmentParameteriv(const Framebuffer *framebuffer,
                                            GLenum attachment,
@@ -24,6 +25,7 @@
                                            GLint *params);
 void QueryBufferParameteriv(const Buffer *buffer, GLenum pname, GLint *params);
 void QueryProgramiv(const Program *program, GLenum pname, GLint *params);
+void QueryRenderbufferiv(const Renderbuffer *renderbuffer, GLenum pname, GLint *params);
 }
 
 #endif  // LIBANGLE_QUERYUTILS_H_