update_engine: Add new operation codes for a to b operations

Add SOURCE_COPY and SOURCE_BSDIFF operations to protobuf. These
operations are for delta minor version 2 and their input is the source
partition instead of the target partition.

BUG=chromium:459363
TEST=`FEATURES=test emerge-link update_engine`

Change-Id: I2c5c83ab5063ff6ce7fc2ec8acfe809d9526b6da
Reviewed-on: https://chromium-review.googlesource.com/250951
Reviewed-by: Alex Deymo <deymo@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Allie Wood <alliewood@chromium.org>
Tested-by: Allie Wood <alliewood@chromium.org>
diff --git a/payload_generator/graph_utils.cc b/payload_generator/graph_utils.cc
index dd0c873..2d8c051 100644
--- a/payload_generator/graph_utils.cc
+++ b/payload_generator/graph_utils.cc
@@ -152,6 +152,12 @@
       case DeltaArchiveManifest_InstallOperation_Type_REPLACE_BZ:
         type_str = "REPLACE_BZ";
         break;
+      case DeltaArchiveManifest_InstallOperation_Type_SOURCE_COPY:
+        type_str = "SOURCE_COPY";
+        break;
+      case DeltaArchiveManifest_InstallOperation_Type_SOURCE_BSDIFF:
+        type_str = "SOURCE_BSDIFF";
+        break;
     }
     LOG(INFO) << i
               << (graph[i].valid ? "" : "-INV")