fix skpdiff viewer bug when using relative paths

fix skpdiff viewer bug when using relative paths

BUG=skia:1463
R=djsollen@google.com

Committed: https://code.google.com/p/skia/source/detail?r=10515

[djsollen, 2013-08-01 18:44:00]

https://codereview.chromium.org/21601002/diff/5001/tools/skpdiff/skpdiff_util.h
File tools/skpdiff/skpdiff_util.h (right):

https://codereview.chromium.org/21601002/diff/5001/tools/skpdiff/skpdiff_util...
tools/skpdiff/skpdiff_util.h:58: char* get_absolute_path(const char path[]);
SkString ...(const SkString& path);

That way you don't have to worry about freeing the memory explicitly.

[djsollen, 2013-08-01 20:03:32]

https://codereview.chromium.org/21601002/diff/11001/tools/skpdiff/skpdiff_uti...
File tools/skpdiff/skpdiff_util.cpp (right):

https://codereview.chromium.org/21601002/diff/11001/tools/skpdiff/skpdiff_uti...
tools/skpdiff/skpdiff_util.cpp:192: char fullPath[PATH_MAX + 1];
SkString fullPath(PATH_MAX + 1);
if (realpath(path.c_str(), fullPath.writable_str()) == NULL) {
  fullPath.reset();
}
return fullPath;

[djsollen, 2013-08-01 20:21:34]

lgtm

[Zach Reizner, 2013-08-02 15:54:48]

Committed patchset #4 manually as r10515 (presubmit successful).