Add support for encoding/decoding WebP images.

blimp/client/feature/compositor/decoding_image_generator.h

Index: blimp/client/feature/compositor/decoding_image_generator.h
diff --git a/blimp/client/feature/compositor/decoding_image_generator.h b/blimp/client/feature/compositor/decoding_image_generator.h
new file mode 100644
index 0000000000000000000000000000000000000000..1062cb85b236a1459c0ea740c4120cd02f359051
--- /dev/null
+++ b/blimp/client/feature/compositor/decoding_image_generator.h
@@ -0,0 +1,47 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BLIMP_CLIENT_FEATURE_COMPOSITOR_DECODING_IMAGE_GENERATOR_H_
+#define BLIMP_CLIENT_FEATURE_COMPOSITOR_DECODING_IMAGE_GENERATOR_H_
+
+#include "base/macros.h"
+#include "third_party/skia/include/core/SkImageGenerator.h"
+#include "third_party/skia/include/core/SkImageInfo.h"
+
+class SkData;
+
+namespace blimp {
+namespace client {
+
+class DecodingImageGenerator : public SkImageGenerator {
+ public:
+  static SkImageGenerator* create(SkData* data);
+  explicit DecodingImageGenerator(const SkImageInfo info,
+                                  const void* data,
+                                  size_t size);
+  ~DecodingImageGenerator() override;
+
+ protected:
+  // SkImageGenerator implementation.
+  bool onGetPixels(const SkImageInfo&,
+                   void* pixels,
+                   size_t rowBytes,
+                   SkPMColor table[],
+                   int* tableCount) override;
+
+  bool onGetYUV8Planes(SkISize sizes[3],
+                       void* planes[3],
+                       size_t rowBytes[3],
+                       SkYUVColorSpace*) override;
+
+ private:
+  SkBitmap decoded_bitmap_;
+
+  DISALLOW_COPY_AND_ASSIGN(DecodingImageGenerator);
+};
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_FEATURE_COMPOSITOR_DECODING_IMAGE_GENERATOR_H_