Use new API instead of the deprecated ones

src/codec/SkRawCodec.cpp

Index: src/codec/SkRawCodec.cpp
diff --git a/src/codec/SkRawCodec.cpp b/src/codec/SkRawCodec.cpp
index 4cd44a4df1f8c6300bc9ae3155ce436078b17f8b..655d14ea076d7ec12955691d23237f433c61ac57 100644
--- a/src/codec/SkRawCodec.cpp
+++ b/src/codec/SkRawCodec.cpp
@@ -572,13 +572,13 @@ SkCodec* SkRawCodec::NewFromStream(SkStream* stream) {
     if (::piex::IsRaw(&piexStream)) {
         ::piex::Error error = ::piex::GetPreviewImageData(&piexStream, &imageData);
 
-        if (error == ::piex::Error::kOk && imageData.preview_length > 0) {
+        if (error == ::piex::Error::kOk && imageData.preview.length > 0) {

[scroggo, 2016/02/23 15:55:23]

Unfortunately, this will mean that we need to update piex in nyc-dev in order to
merge Skia into master. The way we typically handle this is is with macros.
Something like:

#ifdef SK_LEGACY_PREVIEW_LENGTH
  if (error == ::piex::Error::kOk && imageData.preview_length > 0) {
#else
  if (error == ::piex::Error::kOk && imageData.preview.length > 0) {
#endif

We can define SK_LEGACY_PREVIEW_LENGTH in Android until piex gets updated to
have the new API. Then we can delete the old code in Skia and then delete the
old API in piex.

 #if !defined(GOOGLE3)
             // transferBuffer() is destructive to the rawStream. Abandon the rawStream after this
             // function call.
             // FIXME: one may avoid the copy of memoryStream and use the buffered rawStream.
             SkMemoryStream* memoryStream =
-                rawStream->transferBuffer(imageData.preview_offset, imageData.preview_length);
+                rawStream->transferBuffer(imageData.preview.offset, imageData.preview.length);
             return memoryStream ? SkJpegCodec::NewFromStream(memoryStream) : nullptr;
 #else
             return nullptr;