Add path utils, plus a test for it.

src/utils/SkOSFile.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkOSFile.h"
 
 #ifdef SK_BUILD_FOR_WIN
@@ skipping 208 matching lines @@
         if (entry)  // we broke out with a file
         {
             if (name)
                 name->set(entry->d_name);
             return true;
         }
     }
     return false;
 }
 
+namespace SkOSPathUtils {

[epoger, 2013/05/24 16:42:55]

I agree that SkOSFile is declared/defined in a strange mix of locations.

Luckily, I don't think that's your problem to solve in this CL.  So I think
where you put stuff is fine.

+    SkString SkPathJoin(const char *rootPath, const char *relativePath) {
+        SkString result(rootPath);
+        if (!result.endsWith(SkPATH_SEPARATOR)) {
+            result.appendUnichar(SkPATH_SEPARATOR);
+        }
+        result.append(relativePath);
+        return result;
+    }
+
+    SkString SkBasename(const char* fullPath) {
+        if (!fullPath) {
+            return SkString();
+        }
+        const char* filename = strrchr(fullPath, SkPATH_SEPARATOR);
+        if (NULL == filename) {
+            filename = fullPath;
+        } else {
+            ++filename;
+        }
+        return SkString(filename);
+    }
+}
 #endif