make SkPath::conservativelyContainsRect consume degenerate segments

BUG=skia:

Change-Id: I3a39318bceaf6c95a50d84961d93af4ba62550e3
Reviewed-on: https://skia-review.googlesource.com/6900
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index 53678de..4c7ebe5 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -263,14 +263,14 @@
 
     SkPoint firstPt;
     SkPoint prevPt;
-    RawIter iter(*this);
+    SkPath::Iter iter(*this, true);
     SkPath::Verb verb;
     SkPoint pts[4];
     SkDEBUGCODE(int moveCnt = 0;)
     SkDEBUGCODE(int segmentCount = 0;)
     SkDEBUGCODE(int closeCount = 0;)
 
-    while ((verb = iter.next(pts)) != kDone_Verb) {
+    while ((verb = iter.next(pts, true, true)) != kDone_Verb) {
         int nextPt = -1;
         switch (verb) {
             case kMove_Verb: