[Zucchini] Introduce ReferenceBytesMixer.

Some architectures (e.g., ARM) have references that mix operation bits
with payload bits. ReferenceBytesMixer is a class to isloate operation
bit changes to Layer 1 patching.

This CL introduces only the stub for ReferenceBytesMixer (the remainder
would require ARM support). Having this now brings Zucchini-gen closer
to trunk code, and sets up upcoming work for a mock disassembler.

Change-Id: I2e1aa56bf265e4b61b33d323be2ed9a456e14f3b
Reviewed-on: https://chromium-review.googlesource.com/1021650
Commit-Queue: Samuel Huang <huangs@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552373}
NOKEYCHECK=True
GitOrigin-RevId: fdb4806d8d03c52ffe4ca7b14076f483384eedfb

1 files changed, 2 insertions, 0 deletions

diff --git a/zucchini_gen.h b/zucchini_gen.h
index a0f3630..17f1fd4 100644
--- a/zucchini_gen.h
+++ b/zucchini_gen.h
@@ -18,6 +18,7 @@ class EquivalenceMap;
 class OffsetMapper;
 class ImageIndex;
 class PatchElementWriter;
+class ReferenceBytesMixer;
 class ReferenceDeltaSink;
 class ReferenceSet;
 class TargetPool;
@@ -48,6 +49,7 @@ bool GenerateRawDelta(ConstBufferView old_image,
                       ConstBufferView new_image,
                       const EquivalenceMap& equivalence_map,
                       const ImageIndex& new_image_index,
+                      ReferenceBytesMixer* reference_bytes_mixer,
                       PatchElementWriter* patch_writer);
 
 // Writes reference delta between references from |old_refs| and from