Create an SkAndroidCodec API separate from SkCodec

src/codec/SkWebpAdapterCodec.h

Index: src/codec/SkWebpAdapterCodec.h
diff --git a/src/codec/SkWebpAdapterCodec.h b/src/codec/SkWebpAdapterCodec.h
new file mode 100644
index 0000000000000000000000000000000000000000..b48f39bb60cd8eddf4faf9662b898030a9db6f06
--- /dev/null
+++ b/src/codec/SkWebpAdapterCodec.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SkWebpAdapterCodec_DEFINED
+#define SkWebpAdapterCodec_DEFINED
+
+#include "SkAndroidCodec.h"
+#include "SkWebpCodec.h"
+
+/**
+ *  This class implements the functionality of SkAndroidCodec.  It uses an
+ *  SkWebpCodec.
+ */
+class SkWebpAdapterCodec : public SkAndroidCodec {
+public:
+
+    explicit SkWebpAdapterCodec(SkWebpCodec*);
+
+    virtual ~SkWebpAdapterCodec() {}
+
+protected:
+
+    SkEncodedFormat onGetEncodedFormat() const override { return kWEBP_SkEncodedFormat; };
+
+    SkISize onGetSampledDimensions(int sampleSize) const override;
+
+    bool onGetSupportedSubset(SkIRect* desiredSubset) const override;
+
+    SkCodec::Result onGetAndroidPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
+            AndroidOptions& options) override;
+
+private:
+
+    SkAutoTDelete<SkWebpCodec> fCodec;
+
+    typedef SkAndroidCodec INHERITED;
+};
+#endif // SkWebpAdapterCodec_DEFINED