Add gpu support for glVertexAttrb1f, 2fv, and 3fv

BUG=skia:

Review URL: https://codereview.chromium.org/662583003
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index 063de56..8054fd5 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -184,6 +184,11 @@
         NULL == fFunctions.fUniformMatrix3fv ||
         NULL == fFunctions.fUniformMatrix4fv ||
         NULL == fFunctions.fUseProgram ||
+#if 0
+        NULL == fFunctions.fVertexAttrib1f ||
+        NULL == fFunctions.fVertexAttrib2fv ||
+        NULL == fFunctions.fVertexAttrib3fv ||
+#endif
         NULL == fFunctions.fVertexAttrib4fv ||
         NULL == fFunctions.fVertexAttribPointer ||
         NULL == fFunctions.fViewport ||