Merge changes from topic "protobuf-3.9.1"

* changes:
  Keep proguard fields for lite runtime
  Install vendorcompat verison of protobuf
  Make javanano a plugin

core/java_common.mk

@@ -86,6 +86,8 @@ ifeq ($(LOCAL_PROTOC_OPTIMIZE_TYPE),micro)
   $(proto_java_srcjar): $(HOST_OUT_EXECUTABLES)/protoc-gen-javamicro
 else ifeq ($(LOCAL_PROTOC_OPTIMIZE_TYPE),nano)
   $(proto_java_srcjar): PRIVATE_PROTO_JAVA_OUTPUT_OPTION := --javanano_out
+  $(proto_java_srcjar): PRIVATE_PROTOC_FLAGS += --plugin=$(HOST_OUT_EXECUTABLES)/protoc-gen-javanano
+  $(proto_java_srcjar): $(HOST_OUT_EXECUTABLES)/protoc-gen-javanano
 else ifeq ($(LOCAL_PROTOC_OPTIMIZE_TYPE),stream)
   $(proto_java_srcjar): PRIVATE_PROTO_JAVA_OUTPUT_OPTION := --javastream_out
   $(proto_java_srcjar): PRIVATE_PROTOC_FLAGS += --plugin=$(HOST_OUT_EXECUTABLES)/protoc-gen-javastream

core/proguard_basic_keeps.flags

@@ -72,3 +72,7 @@
 
 # Less spammy.
 -dontnote
+
+# The lite proto runtime uses reflection to access fields based on the names in
+# the schema, keep all the fields.
+-keepclassmembers class * extends com.google.protobuf.MessageLite { <fields>; }

target/product/base_vendor.mk

@@ -75,3 +75,7 @@ PRODUCT_PACKAGES += \
 # VINTF data for vendor image
 PRODUCT_PACKAGES += \
     device_compatibility_matrix.xml \
+
+PRODUCT_PACKAGES += \
+    libprotobuf-cpp-lite-vendorcompat \
+    libprotobuf-cpp-full-vendorcompat \