Separate gfx_ipc into skia-dependent and non-skia-dependent parts

extensions/common/extension_utility_messages.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.
 
 // Multiply-included message file, so no include guard.
 
 #include <string>
 #include <tuple>
 
 #include "extensions/common/update_manifest.h"
 #include "ipc/ipc_message_macros.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/ipc/gfx_param_traits.h"
+#include "ui/gfx/ipc/gfx_skia_param_traits.h"

[Devlin, 2016/03/28 21:01:51]

ditto

[Mark Dittmer, 2016/03/30 22:04:41]

Removed unnecessary non-skia include.

 #include "url/ipc/url_param_traits.h"
 
 #define IPC_MESSAGE_START ExtensionUtilityMsgStart
 
 #ifndef EXTENSIONS_COMMON_EXTENSION_UTILITY_MESSAGES_H_
 #define EXTENSIONS_COMMON_EXTENSION_UTILITY_MESSAGES_H_
 
 using DecodedImages = std::vector<std::tuple<SkBitmap, base::FilePath>>;
 
 #endif  //  EXTENSIONS_COMMON_EXTENSION_UTILITY_MESSAGES_H_
@@ skipping 64 matching lines @@
 // DecodedImages struct into a file named kDecodedImagesFilename in the
 // directory that was passed in. This is done because the data is too large to
 // pass over IPC.
 IPC_MESSAGE_CONTROL1(ExtensionUtilityHostMsg_UnpackExtension_Succeeded,
                      base::DictionaryValue /* manifest */)
 
 // Reply when the utility process has failed while unpacking an extension.
 // |error_message| is a user-displayable explanation of what went wrong.
 IPC_MESSAGE_CONTROL1(ExtensionUtilityHostMsg_UnpackExtension_Failed,
                      base::string16 /* error_message, if any */)