Stopped skipping tests in dm of SkPatch by implementing the
corresponding drawPath calls on classes that derive from SkCanvas.

BUG=skia:
R=egdaniel@google.com, bsalomon@google.com, mtklein@google.com, robertphillips@google.com

Author: dandov@google.com

Review URL: https://codereview.chromium.org/429343004
diff --git a/src/utils/SkNWayCanvas.cpp b/src/utils/SkNWayCanvas.cpp
index 11e4a65..b33c99e 100644
--- a/src/utils/SkNWayCanvas.cpp
+++ b/src/utils/SkNWayCanvas.cpp
@@ -284,6 +284,13 @@
     }
 }
 
+void SkNWayCanvas::drawPatch(const SkPatch& patch, const SkPaint& paint) {
+    Iter iter(fList);
+    while (iter.next()) {
+        iter->drawPatch(patch, paint);
+    }
+}
+
 void SkNWayCanvas::drawData(const void* data, size_t length) {
     Iter iter(fList);
     while (iter.next()) {