fix deserialization after FirstDirection change to paths

src/core/SkPath.cpp

Index: src/core/SkPath.cpp
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index defedd2e5db4026a38f33e38e18310aabfd7da9d..daac0772dcde6b55c19e8be6faeddbfa0f1187d8 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -1861,7 +1861,8 @@ size_t SkPath::writeToMemory(void* storage) const {
     int32_t packed = (fConvexity << kConvexity_SerializationShift) |
                      (fFillType << kFillType_SerializationShift) |
                      (fFirstDirection << kDirection_SerializationShift) |
-                     (fIsVolatile << kIsVolatile_SerializationShift);
+                     (fIsVolatile << kIsVolatile_SerializationShift) |
+                     kCurrent_Version;
 
     buffer.write32(packed);
 
@@ -1879,12 +1880,33 @@ size_t SkPath::readFromMemory(const void* storage, size_t length) {
         return 0;
     }
 
+    unsigned version = packed & 0xFF;
+    
     fConvexity = (packed >> kConvexity_SerializationShift) & 0xFF;
     fFillType = (packed >> kFillType_SerializationShift) & 0xFF;
-    fFirstDirection = (packed >> kDirection_SerializationShift) & 0x3;
+    uint8_t dir = (packed >> kDirection_SerializationShift) & 0x3;
     fIsVolatile = (packed >> kIsVolatile_SerializationShift) & 0x1;
     SkPathRef* pathRef = SkPathRef::CreateFromBuffer(&buffer);
 
+    // compatibility check
+    if (version < kPathPrivFirstDirection_Version) {
+        switch (dir) {  // old values
+            case 0:
+                fFirstDirection = SkPathPriv::kUnknown_FirstDirection;
+                break;
+            case 1:
+                fFirstDirection = SkPathPriv::kCW_FirstDirection;
+                break;
+            case 2:
+                fFirstDirection = SkPathPriv::kCCW_FirstDirection;
+                break;
+            default:
+                SkASSERT(false);
+        }
+    } else {
+        fFirstDirection = dir;
+    }
+
     size_t sizeRead = 0;
     if (buffer.isValid()) {
         fPathRef.reset(pathRef);