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/libANGLE/validationES.cpp b/src/libANGLE/validationES.cpp
index 08ded1d..3f144bd 100644
--- a/src/libANGLE/validationES.cpp
+++ b/src/libANGLE/validationES.cpp
@@ -1107,7 +1107,7 @@
     }
 
     GLenum targetBoolType = VariableBoolVectorType(uniformType);
-    bool samplerUniformCheck = (IsSampler(uniform->type) && uniformType == GL_INT);
+    bool samplerUniformCheck = (IsSamplerType(uniform->type) && uniformType == GL_INT);
     if (!samplerUniformCheck && uniformType != uniform->type && targetBoolType != uniform->type)
     {
         context->recordError(Error(GL_INVALID_OPERATION));