Add SkAutoPixmapStorage::detachPixelsAsData()

src/core/SkPixmap.cpp

Index: src/core/SkPixmap.cpp
diff --git a/src/core/SkPixmap.cpp b/src/core/SkPixmap.cpp
index 943287bad30a22373b1954342c8f02ad395d2cc5..e2d4d30ebff3a07aa07368262ba7b31f1427ca26 100644
--- a/src/core/SkPixmap.cpp
+++ b/src/core/SkPixmap.cpp
@@ -7,6 +7,7 @@
 
 #include "SkColorPriv.h"
 #include "SkConfig8888.h"
+#include "SkData.h"
 #include "SkMask.h"
 #include "SkPixmap.h"
 #include "SkUtils.h"
@@ -272,3 +273,15 @@ void SkAutoPixmapStorage::alloc(const SkImageInfo& info) {
         sk_throw();
     }
 }
+
+const SkData* SkAutoPixmapStorage::detachPixelsAsData() {
+    if (!fStorage) {
+        return nullptr;
+    }
+
+    const SkData* data = SkData::NewFromMalloc(fStorage, this->getSafeSize());
+    fStorage = nullptr;
+    this->INHERITED::reset();
+
+    return data;
+}