[Suggestions] Introduce a different image encoder/decoder for iOS

components/suggestions/image_encoder_ios.h

+// Copyright 2014 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 COMPONENTS_SUGGESTIONS_IMAGE_ENCODER_IOS_H_
+#define COMPONENTS_SUGGESTIONS_IMAGE_ENCODER_IOS_H_
+
+#include <vector>
+
+class SkBitmap;
+
+namespace suggestions {
+
+// From encoded bytes to SkBitmap. It's the caller's responsibility to delete

[blundell, 2014/10/10 19:28:42]

You actually don't even need this; just include image_encoder.h in
image_encoder_ios.mm.

+// the bitmap.
+SkBitmap* DecodeJPEGToSkBitmap(const std::vector<unsigned char>& encoded_data);

[Stephen White, 2014/10/10 19:32:35]

BTW, you can actually just return an SkBitmap by value; it refcounts its
SkPixelRef data internally, so copying it is relatively cheap.

+
+// From SkBitmap to a vector of JPEG-encoded bytes, |dst|.
+bool EncodeSkBitmapToJPEG(const SkBitmap& bitmap,
+                          std::vector<unsigned char>* dest);
+
+}  // namespace suggestions
+
+#endif  // COMPONENTS_SUGGESTIONS_IMAGE_ENCODER_IOS_H_