Implement glRenderbufferStorageMultisample using glRenderbufferStorageMultisampleANGLE.

TRAC #23063
Signed-off-by: Jamie Madill
Signed-off-by: Shannon Woods
Author: Nicolas Capens

git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2384 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/libGLESv2.cpp b/src/libGLESv2/libGLESv2.cpp
index 388452c..302d962 100644
--- a/src/libGLESv2/libGLESv2.cpp
+++ b/src/libGLESv2/libGLESv2.cpp
@@ -8381,7 +8381,7 @@
                 return gl::error(GL_INVALID_OPERATION);
             }
 
-            UNIMPLEMENTED();
+            glRenderbufferStorageMultisampleANGLE(target, samples, internalformat, width, height);
         }
     }
     catch(std::bad_alloc&)