Adding a tool to get images from skps

tools/flags/SkCommandLineFlags.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SK_COMMAND_LINE_FLAGS_H
 #define SK_COMMAND_LINE_FLAGS_H
 
@@ skipping 90 matching lines @@
 class SkCommandLineFlags {
 
 public:
     /**
      *  Call to set the help message to be displayed. Should be called before
      *  Parse.
      */
     static void SetUsage(const char* usage);
 
     /**
+     *  Call this to display the help message. Should be called after SetUsage.
+     */
+    static void PrintUsage();
+
+    /**
      *  Call at the beginning of main to parse flags created by DEFINE_x, above.
      *  Must only be called once.
      */
     static void Parse(int argc, char** argv);
 
     /**
      *  Custom class for holding the arguments for a string flag.
      *  Publicly only has accessors so the strings cannot be modified.
      */
     class StringArray {
@@ skipping 361 matching lines @@
     double*              fDoubleValue;
     double               fDefaultDouble;
     SkCommandLineFlags::StringArray* fStrings;
     // Both for the help string and in case fStrings is empty.
     SkString             fDefaultString;
 
     // In order to keep a linked list.
     SkFlagInfo*          fNext;
 };
 #endif // SK_COMMAND_LINE_FLAGS_H