GLES1: glLoadIdentity / glLoadMatrix(f|x)

BUG=angleproject:2306

Change-Id: I46fe961e6eb87b2f41c39afe1e943d9146a0abfa
Reviewed-on: https://chromium-review.googlesource.com/1002913
Commit-Queue: Lingfeng Yang <lfy@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/libANGLE/validationES1.cpp b/src/libANGLE/validationES1.cpp
index 58e32f8..c176392 100644
--- a/src/libANGLE/validationES1.cpp
+++ b/src/libANGLE/validationES1.cpp
@@ -323,19 +323,19 @@
 
 bool ValidateLoadIdentity(Context *context)
 {
-    UNIMPLEMENTED();
+    ANGLE_VALIDATE_IS_GLES1(context);
     return true;
 }
 
 bool ValidateLoadMatrixf(Context *context, const GLfloat *m)
 {
-    UNIMPLEMENTED();
+    ANGLE_VALIDATE_IS_GLES1(context);
     return true;
 }
 
 bool ValidateLoadMatrixx(Context *context, const GLfixed *m)
 {
-    UNIMPLEMENTED();
+    ANGLE_VALIDATE_IS_GLES1(context);
     return true;
 }