Roll DEPS for Skia to 317, to pick up some new SkASSERT's....

DEPS

 vars = {
   "webkit_trunk":
     "http://svn.webkit.org/repository/webkit/trunk",
   "webkit_revision": "47041",
 }
 
 
 deps = {
   "src/breakpad/src":
     "http://google-breakpad.googlecode.com/svn/trunk/src@346",
@@ skipping 22 matching lines @@
   "src/tools/gyp":
     "http://gyp.googlecode.com/svn/trunk@591",
 
   "src/v8":
     "http://v8.googlecode.com/svn/trunk@2649",
 
   "src/native_client":
     "http://nativeclient.googlecode.com/svn/trunk/src/native_client@385",
 
   "src/third_party/skia":
-    "http://skia.googlecode.com/svn/trunk@313",
+    "http://skia.googlecode.com/svn/trunk@317",
 
   "src/third_party/WebKit/LayoutTests":
     Var("webkit_trunk") + "/LayoutTests@" + Var("webkit_revision"),
 
   "src/third_party/WebKit/JavaScriptCore":
     Var("webkit_trunk") + "/JavaScriptCore@" + Var("webkit_revision"),
 
   "src/third_party/WebKit/WebCore":
     Var("webkit_trunk") + "/WebCore@" + Var("webkit_revision"),
 
@@ skipping 96 matching lines @@
     # A change to a .gyp, .gypi, or to GYP itself shound run the generator.
     "pattern": "\\.gypi?$|[/\\\\]src[/\\\\]tools[/\\\\]gyp[/\\\\]",
     "action": ["python", "src/tools/gyp/gyp_chromium"],
   },
   {
     # Workaround IncrediBuild problem. http://crbug.com/17706.
     "pattern": "\\.grd$",
     "action": ["python", "src/build/win/clobber_generated_headers.py", "$matching_files"],
   },
 ]