Complete half-done cherry-picking of Android.mk. DO NOT MERGE

The previous commit, 9036c194b0, was
incompletely cherry-picked. This adds the missing parts.

Bug: 24570591
Change-Id: I1097c60587fb8a88cfe6b8ffed5b1689d9bdd429

engine/src/flutter/libs/minikin/Android.mk

@@ -16,7 +16,7 @@ LOCAL_PATH := $(call my-dir)
 
 include $(CLEAR_VARS)
 
-LOCAL_SRC_FILES := \
+minikin_src_files := \
     AnalyzeStyle.cpp \
     CmapCoverage.cpp \
     FontCollection.cpp \
@@ -31,14 +31,12 @@ LOCAL_SRC_FILES := \
     MinikinFontFreeType.cpp \
     SparseBitSet.cpp
 
-LOCAL_MODULE := libminikin
-
-LOCAL_C_INCLUDES += \
+minikin_c_includes += \
     external/harfbuzz_ng/src \
     external/freetype/include \
     frameworks/minikin/include
 
-LOCAL_SHARED_LIBRARIES := \
+minikin_shared_libraries := \
     libharfbuzz_ng \
     libft2 \
     liblog \
@@ -47,6 +45,12 @@ LOCAL_SHARED_LIBRARIES := \
     libicuuc \
     libutils
 
+LOCAL_MODULE := libminikin
+LOCAL_EXPORT_C_INCLUDE_DIRS := frameworks/minikin/include
+LOCAL_SRC_FILES := $(minikin_src_files)
+LOCAL_C_INCLUDES := $(minikin_c_includes)
+LOCAL_SHARED_LIBRARIES := $(minikin_shared_libraries)
+
 include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)