Turned on SkSL->GLSL compiler

src/sksl/SkSLParser.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 "stdio.h"
 #include "SkSLParser.h"
 #include "SkSLToken.h"
@@ skipping 167 matching lines @@
             this->error(p.fPosition, "expected 'lowp', 'mediump', or 'highp', but found '" + 
                                      p.fText + "'");
             return;
     }
     if (!this->type()) {
         return;
     }
     this->expect(Token::SEMICOLON, "';'");
 }
 
-/* DIRECTIVE(#version) INT_LITERAL | DIRECTIVE(#extension) IDENTIFIER COLON IDENTIFIER */
+/* DIRECTIVE(#version) INT_LITERAL ("es" | "compatibility")? | 
+   DIRECTIVE(#extension) IDENTIFIER COLON IDENTIFIER */
 std::unique_ptr<ASTDeclaration> Parser::directive() {
     Token start;
     if (!this->expect(Token::DIRECTIVE, "a directive", &start)) {
         return nullptr;
     }
     if (start.fText == "#version") {
         this->expect(Token::INT_LITERAL, "a version number");
-        // ignored for now
+        Token next = this->peek();
+        if (next.fText == "es" || next.fText == "compatibility") {
+            this->nextToken();
+        }
+        // version is ignored for now; it will eventually become an error when we stop pretending
+        // to be GLSL
         return nullptr;
     } else if (start.fText == "#extension") {
         Token name;
         if (!this->expect(Token::IDENTIFIER, "an identifier", &name)) {
             return nullptr;
         }
         if (!this->expect(Token::COLON, "':'")) {
             return nullptr;
         }
         // FIXME: need to start paying attention to this token
@@ skipping 1191 matching lines @@
 bool Parser::identifier(std::string* dest) {
     Token t;
     if (this->expect(Token::IDENTIFIER, "identifier", &t)) {
         *dest = t.fText; 
         return true;
     }
     return false;
 }
 
 } // namespace