[blimp] Change to use SHA-256 instead of SHA-1 for unique ids

blimp/engine/renderer/engine_image_serialization_processor.cc

 // Copyright 2016 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 "blimp/engine/renderer/engine_image_serialization_processor.h"
 
 #include <stddef.h>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
-#include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"

[Wez, 2016/04/23 00:08:52]

Do we use string_util.h in here?

[nyquist, 2016/04/25 08:11:17]

Done.

 #include "base/trace_event/trace_event.h"
 #include "blimp/common/blob_cache/id_util.h"
 #include "blimp/common/compositor/webp_decoder.h"
 #include "blimp/common/proto/blob_cache.pb.h"
 #include "content/public/renderer/render_frame.h"
 #include "third_party/libwebp/webp/encode.h"
 #include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "third_party/skia/include/core/SkPixelSerializer.h"
 #include "third_party/skia/include/core/SkUnPreMultiply.h"
@@ skipping 202 matching lines @@
   return pixel_serializer_.get();
 }
 
 SkPicture::InstallPixelRefProc
 EngineImageSerializationProcessor::GetPixelDeserializer() {
   return nullptr;
 }
 
 }  // namespace engine
 }  // namespace blimp