Add GYP target for sk_tool_utils.* component.

tools/sk_tool_utils.cpp

Index: tools/sk_tool_utils.cpp
diff --git a/tools/sk_tool_utils.cpp b/tools/sk_tool_utils.cpp
index 3eb55554b6dc780042b49c2b2587be073e147cf4..c75c496a890c0d2526d74cc93d01bf6c305ae288 100644
--- a/tools/sk_tool_utils.cpp
+++ b/tools/sk_tool_utils.cpp
@@ -1,5 +1,15 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
 #include "sk_tool_utils.h"
 
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+
 namespace sk_tool_utils {
 
 const char* colortype_name(SkColorType ct) {
@@ -29,4 +39,4 @@ void write_pixels(SkCanvas* canvas, const SkBitmap& bitmap, int x, int y,
     canvas->writePixels(info, tmp.getPixels(), tmp.rowBytes(), x, y);
 }
 
-}
+}  // namespace sk_tool_utils