Move gm-expected to trunk/expectations/gm , and modify scripts that use it.

R=borenet@google.com

Review URL: https://codereview.chromium.org/19697017

git-svn-id: http://skia.googlecode.com/svn/trunk@10281 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/svndiff.py b/tools/svndiff.py
index bb064b7..9e51eee 100755
--- a/tools/svndiff.py
+++ b/tools/svndiff.py
@@ -311,7 +311,8 @@
                       'will search for it in typical directories near this '
                       'script')
     parser.add_option(OPTION_SOURCE_DIR,
-                      action='store', type='string', default='.',
+                      action='store', type='string',
+                      default=os.path.join('expectations', 'gm'),
                       help='root directory within which to compare all ' +
                       'files; defaults to "%default"')
     (options, args) = parser.parse_args()