Change SkStream.

src/ports/SkFontHost_fontconfig.cpp

Index: src/ports/SkFontHost_fontconfig.cpp
===================================================================
--- src/ports/SkFontHost_fontconfig.cpp	(revision 9222)
+++ src/ports/SkFontHost_fontconfig.cpp	(working copy)
@@ -136,16 +136,30 @@
 SkStream* FontConfigTypeface::onOpenStream(int* ttcIndex) const {
     SkStream* stream = this->getLocalStream();
     if (stream) {
-        // TODO: fix issue 1176.
-        // As of now open_stream will return a stream and unwind it, but the
-        // SkStream is not thread safe, and if two threads use the stream they
-        // may collide and print preview for example could still fail,
-        // or there could be some failures in rendering if this stream is used
-        // there.
+        // should have been provided by CreateFromStream()
+        *ttcIndex = 0;
+
+        SkAutoTUnref<SkStream> dupStream(stream->duplicate());
+        if (dupStream) {
+            return dupStream.detach();
+        }
+
+        // TODO: update interface use, remove the following code in this block.
+        size_t length = stream->getLength();
+
+        const void* memory = stream->getMemoryBase();
+        if (NULL != memory) {
+            return new SkMemoryStream(memory, length);
+        }
+
+        SkAutoTMalloc<uint8_t> allocMemory(length);
         stream->rewind();
+        if (length == stream->read(allocMemory.get(), length)) {
+            return new SkMemoryStream(allocMemory.detach(), length);
+        }
+
+        stream->rewind();
         stream->ref();
-        // should have been provided by CreateFromStream()
-        *ttcIndex = 0;
     } else {
         SkAutoTUnref<SkFontConfigInterface> fci(RefFCI());
         if (NULL == fci.get()) {