Adding release method to SkWriter32 and using it to not copy the ops data from SkPictureRecord to S…

src/core/SkWriter32.cpp

Index: src/core/SkWriter32.cpp
diff --git a/src/core/SkWriter32.cpp b/src/core/SkWriter32.cpp
index 041e2fef68cff730e1ffccc639210753755cfe6e..516979c3318a43906b95746070e62147740cd4aa 100644
--- a/src/core/SkWriter32.cpp
+++ b/src/core/SkWriter32.cpp
@@ -8,6 +8,7 @@
 #include "SkReader32.h"
 #include "SkString.h"
 #include "SkWriter32.h"
+#include "SkData.h"
 
 /*
  *  Strings are stored as: length[4-bytes] + string_data + '\0' + pad_to_mul_4
@@ -83,3 +84,20 @@ void SkWriter32::growToAtLeast(size_t size) {
         memcpy(fData, fExternal, fUsed);
     }
 }
+
+SkData* SkWriter32::detatchAsData() {
+    uint8_t* buffer = NULL;
+    if ((fExternal != NULL) && (fData == fExternal)) {
+        // We need to copy to an allocated buffer before returning.
+        buffer = (uint8_t*)sk_malloc_throw(fUsed);
+        memcpy(buffer, fData, fUsed);
+    } else {
+        buffer = fInternal.detach();
+    }
+    SkData* data = SkData::NewFromMalloc(buffer, fUsed);
+    fData = NULL;
+    fCapacity = 0;
+    fUsed = 0;
+    fExternal = NULL;
+    return data;
+}