Add buffer helper to read directly into SkString to avoid extra copying

include/core/SkPaintOptionsAndroid.h

 
 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPaintOptionsAndroid_DEFINED
 #define SkPaintOptionsAndroid_DEFINED
 
 #ifdef SK_BUILD_FOR_ANDROID
 
 #include "SkString.h"
 #include "SkTypes.h"
 
 class SkFlattenableReadBuffer;
 class SkFlattenableWriteBuffer;
 
 /** \class SkLanguage
 
     The SkLanguage class represents a human written language, and is used by
     text draw operations to determine which glyph to draw when drawing
     characters with variants (ie Han-derived characters).
 */
 class SkLanguage {
 public:
     SkLanguage() { }
+    SkLanguage(const SkString& tag) : fTag(tag) { }
     SkLanguage(const char* tag) : fTag(tag) { }
     SkLanguage(const char* tag, size_t len) : fTag(tag, len) { }
     SkLanguage(const SkLanguage& b) : fTag(b.fTag) { }
 
     /** Gets a BCP 47 language identifier for this SkLanguage.
         @return a BCP 47 language identifier representing this language
     */
     const SkString& getTag() const { return fTag; }
 
     /** Performs BCP 47 fallback to return an SkLanguage one step more general.
@@ skipping 79 matching lines @@
     }
 
 private:
     SkLanguage fLanguage;
     FontVariant fFontVariant;
     bool fUseFontFallbacks;
 };
 
 #endif // #ifdef SK_BUILD_FOR_ANDROID
 #endif // #ifndef SkPaintOptionsAndroid_DEFINED