Add SkData::NewFromFD.

src/core/SkData.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkData.h"
 #include "SkFlattenableBuffers.h"
 #include "SkOSFile.h"
@@ skipping 79 matching lines @@
 SkData* SkData::NewFromFILE(SkFILE* f) {
     size_t size;
     void* addr = sk_fmmap(f, &size);
     if (NULL == addr) {
         return NULL;
     }
 
     return SkData::NewWithProc(addr, size, sk_mmap_releaseproc, NULL);
 }
 
+SkData* SkData::NewFromFD(int fd) {
+    size_t size;
+    void* addr = sk_fdmmap(fd, &size);
+    if (NULL == addr) {
+        return NULL;
+    }
+
+    return SkData::NewWithProc(addr, size, sk_mmap_releaseproc, NULL);
+}
+
 // assumes context is a SkData
 static void sk_dataref_releaseproc(const void*, size_t, void* context) {
     SkData* src = reinterpret_cast<SkData*>(context);
     src->unref();
 }
 
 SkData* SkData::NewSubset(const SkData* src, size_t offset, size_t length) {
     /*
         We could, if we wanted/need to, just make a deep copy of src's data,
         rather than referencing it. This would duplicate the storage (of the
@@ skipping 199 matching lines @@
 }
 
 SkDataSet* SkDataSet::NewEmpty() {
     static SkDataSet* gEmptySet;
     if (NULL == gEmptySet) {
         gEmptySet = SkNEW_ARGS(SkDataSet, (NULL, 0));
     }
     gEmptySet->ref();
     return gEmptySet;
 }