Add default resource path for skia test cases in gm and bench tools.

BUG=skia:1765
TEST=./out/Release/gm --match downsamplebitmap_image
R=mtklein@google.com, scroggo@google.com, yunchao.he@intel.com

Review URL: https://codereview.chromium.org/120873002

git-svn-id: http://skia.googlecode.com/svn/trunk@12850 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed