initial checkin of SkSL compiler

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1984363002
CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot

Review-Url: https://codereview.chromium.org/1984363002
diff --git a/src/sksl/SkSLUtil.cpp b/src/sksl/SkSLUtil.cpp
new file mode 100644
index 0000000..327bffe
--- /dev/null
+++ b/src/sksl/SkSLUtil.cpp
@@ -0,0 +1,33 @@
+/*
+ * 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 "SkSLUtil.h"
+
+namespace SkSL {
+
+int stoi(std::string s) {
+    return atoi(s.c_str());
+}
+
+double stod(std::string s) {
+    return atof(s.c_str());
+}
+
+long stol(std::string s) {
+    return atol(s.c_str());
+}
+
+void sksl_abort() {
+#ifdef SKIA
+    sk_abort_no_print();
+    exit(1);
+#else
+    abort();
+#endif
+}
+
+} // namespace