Add RAW decoding support to Skia

src/codec/SkRawAdapterCodec.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkRawAdapterCodec_DEFINED
+#define SkRawAdapterCodec_DEFINED
+
+#include "SkAndroidCodec.h"
+#include "SkCodec.h"
+#include "SkEncodedFormat.h"
+#include "SkRawCodec.h"
+#include "SkStream.h"
+#include "SkTypes.h"
+
+/**
+ *  This class implements the functionality of SkAndroidCodec. It uses an
+ *  SkRawCodec.
+ */
+class SkRawAdapterCodec : public SkAndroidCodec {
+public:
+
+    explicit SkRawAdapterCodec(SkRawCodec*);
+
+    virtual ~SkRawAdapterCodec() {}
+
+protected:
+
+    SkISize onGetSampledDimensions(int sampleSize) const override;
+
+    bool onGetSupportedSubset(SkIRect* /*desiredSubset*/) const override { return false; }
+
+    SkCodec::Result onGetAndroidPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
+            const AndroidOptions& options) override;
+
+private:
+
+    typedef SkAndroidCodec INHERITED;
+};
+#endif // SkRawAdapterCodec_DEFINED