Turned on SkSL->GLSL compiler

tests/SkSLErrorTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSLCompiler.h"
 
 #include "Test.h"
@@ skipping 245 matching lines @@
     test_failure(r,
                  "const int x; void main() { x = 0; }",
                  "error: 1: cannot modify immutable variable 'x'\n1 error\n");
 }
 
 DEF_TEST(SkSLBadIndex, r) {
     test_failure(r,
                  "void main() { int x = 2[0]; }",
                  "error: 1: expected array, but found 'int'\n1 error\n");
     test_failure(r,
-                 "void main() { vec2 x = vec2(0); int y = x[0]; }",
-                 "error: 1: expected array, but found 'vec2'\n1 error\n");
+                 "void main() { vec2 x = vec2(0); int y = x[0][0]; }",
+                 "error: 1: expected array, but found 'float'\n1 error\n");
 }
 
 DEF_TEST(SkSLTernaryMismatch, r) {
     test_failure(r,
                  "void main() { int x = 5 > 2 ? true : 1.0; }",
                  "error: 1: ternary operator result mismatch: 'bool', 'float'\n1 error\n");
 }
 
 DEF_TEST(SkSLInterfaceBlockStorageModifiers, r) {
     test_failure(r,
                  "uniform foo { out int x; };",
                  "error: 1: interface block fields may not have storage qualifiers\n1 error\n");
 }