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

components/suggestions.gypi

 # 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.
 
 {
   'targets': [
     {
       # GN version: //components/suggestions
       'target_name': 'suggestions',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../net/net.gyp:net',
         '../ui/gfx/gfx.gyp:gfx',
         '../url/url.gyp:url_lib',
         'components.gyp:keyed_service_core',
         'components.gyp:pref_registry',
         'components.gyp:variations',
         'components.gyp:variations_http_provider',
       ],
       'sources': [
         'suggestions/blacklist_store.cc',
         'suggestions/blacklist_store.h',
+        'suggestions/image_encoder.h',
         'suggestions/image_fetcher.h',
         'suggestions/image_fetcher_delegate.h',
         'suggestions/image_manager.cc',
         'suggestions/image_manager.h',
         'suggestions/proto/suggestions.proto',
         'suggestions/suggestions_pref_names.cc',
         'suggestions/suggestions_pref_names.h',
         'suggestions/suggestions_service.cc',
         'suggestions/suggestions_service.h',
         'suggestions/suggestions_store.cc',
         'suggestions/suggestions_store.h',
         'suggestions/suggestions_utils.cc',
         'suggestions/suggestions_utils.h',
       ],
       'variables': {
         'proto_in_dir': 'suggestions/proto',
         'proto_out_dir': 'components/suggestions/proto',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
+  'conditions': [
+    ['OS != "ios"', {

[blundell, 2014/10/07 14:13:59]

You (or Justin) should have a comment to add here, as it's not clear why this
target should be !iOS.

[Mathieu, 2014/10/07 16:00:29]

Done.

+      'targets': [
+        {
+        # GN version: //components/suggestions:jpeg_image_encoder
+        'target_name': 'jpeg_image_encoder',
+        'type': 'static_library',
+        'dependencies': [
+          '../base/base.gyp:base',
+          '../ui/gfx/gfx.gyp:gfx',
+          'suggestions',
+        ],
+        'sources': [
+          'suggestions/jpeg_image_encoder.cc',
+          'suggestions/jpeg_image_encoder.h',
+        ],
+        }
+      ]
+    }]
+  ]
 }