formalize named picture versions

src/core/SkReadBuffer.cpp

Index: src/core/SkReadBuffer.cpp
diff --git a/src/core/SkReadBuffer.cpp b/src/core/SkReadBuffer.cpp
index b4bc87529ab5a5b1e1e620d2775f7e7a5f1dedf1..d016d9c980b5ecbc77fc938a059c0cea11add3dc 100644
--- a/src/core/SkReadBuffer.cpp
+++ b/src/core/SkReadBuffer.cpp
@@ -25,7 +25,7 @@ static uint32_t default_flags() {
 
 SkReadBuffer::SkReadBuffer() {
     fFlags = default_flags();
-    fPictureVersion = 0;
+    fVersion = 0;
     fMemoryPtr = NULL;
 
     fBitmapStorage = NULL;
@@ -43,7 +43,7 @@ SkReadBuffer::SkReadBuffer() {
 
 SkReadBuffer::SkReadBuffer(const void* data, size_t size) {
     fFlags = default_flags();
-    fPictureVersion = 0;
+    fVersion = 0;
     fReader.setMemory(data, size);
     fMemoryPtr = NULL;
 
@@ -62,7 +62,7 @@ SkReadBuffer::SkReadBuffer(const void* data, size_t size) {
 
 SkReadBuffer::SkReadBuffer(SkStream* stream) {
     fFlags = default_flags();
-    fPictureVersion = 0;
+    fVersion = 0;
     const size_t length = stream->getLength();
     fMemoryPtr = sk_malloc_throw(length);
     stream->read(fMemoryPtr, length);