[Suggestions] Create ImageEncoder, to abstract away image encode/decode.

components/suggestions/image_encoder.cc

+// 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.h"
+
+#include "ui/gfx/codec/jpeg_codec.h"
+#include "ui/gfx/image/image_skia.h"
+
+namespace suggestions {
+
+SkBitmap* ImageEncoder::DecodeImage(
+    const std::vector<unsigned char>& encoded_data) {
+  return gfx::JPEGCodec::Decode(&encoded_data[0], encoded_data.size());
+}
+
+bool ImageEncoder::EncodeImage(const SkBitmap& bitmap,
+                               std::vector<unsigned char>* dest) {
+  SkAutoLockPixels bitmap_lock(bitmap);
+  if (!bitmap.readyToDraw() || bitmap.isNull()) {
+    return false;
+  }
+  return gfx::JPEGCodec::Encode(
+      reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0)),
+      gfx::JPEGCodec::FORMAT_SkBitmap, bitmap.width(), bitmap.height(),
+      bitmap.rowBytes(), 100, dest);
+}
+
+}  // namespace suggestions