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

components/suggestions/image_encoder_ios.mm

+// 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.
+
+#include "components/suggestions/image_encoder_ios.h"
+
+#import <UIKit/UIKit.h>
+
+#include "base/mac/scoped_cftyperef.h"
+#include "skia/ext/skia_utils_ios.h"
+
+namespace suggestions {
+
+SkBitmap* DecodeJPEGToSkBitmap(const std::vector<unsigned char>& encoded_data) {
+  NSData* data =
+      [NSData dataWithBytes:encoded_data.data() length:encoded_data.size()];
+  UIImage* image =
+     [UIImage imageWithData:data scale:1.0];
+  return new SkBitmap(gfx::CGImageToSkBitmap(image.CGImage, [image size], YES));
+}
+
+bool EncodeSkBitmapToJPEG(const SkBitmap& bitmap,
+                          std::vector<unsigned char>* dest) {
+  base::ScopedCFTypeRef<CGColorSpaceRef> color_space(
+      CGColorSpaceCreateDeviceRGB());
+  UIImage* image =
+      gfx::SkBitmapToUIImageWithColorSpace(bitmap, 1 /* scale */, color_space);
+  NSData* data = UIImageJPEGRepresentation(image, 1.0);
+  const char* bytes = reinterpret_cast<const char*>([data bytes]);
+  dest->assign(bytes, bytes + [data length]);
+  return true;
+}
+
+}  // namespace suggestions