change old picture serialization to really handle images

src/core/SkBitmap.cpp

Index: src/core/SkBitmap.cpp
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index 49e2c04bfb9a20215e39538e231ec043e0595351..8f799125e4d10a9252c3690ad14ea24ab25a1cd8 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -1270,7 +1270,9 @@ bool SkBitmap::requestLock(SkAutoPixmapUnlock* result) const {
         return false;
     }
 
-    SkPixelRef::LockRequest req = { fInfo.dimensions(), kNone_SkFilterQuality };
+    // We have to lock the whole thing (using the pixelref's dimensions) until the api supports
+    // a partial lock (with offset/origin). Hence we can't use our fInfo.
+    SkPixelRef::LockRequest req = { pr->info().dimensions(), kNone_SkFilterQuality };
     SkPixelRef::LockResult res;
     if (pr->requestLock(req, &res)) {
         SkASSERT(res.fPixels);