Rename IsSampler to IsSamplerType.

BUG=angle:733

Change-Id: I62aece16c11aefdbf13c0b5faf83040fdb8555e6
Reviewed-on: https://chromium-review.googlesource.com/232960
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/common/utilities.cpp b/src/common/utilities.cpp
index 5865e4d..64aba03 100644
--- a/src/common/utilities.cpp
+++ b/src/common/utilities.cpp
@@ -254,7 +254,7 @@
     return 0;
 }
 
-bool IsSampler(GLenum type)
+bool IsSamplerType(GLenum type)
 {
     switch (type)
     {