Add soong support for resource shrinking

This adds a new flag to the optimize section to allow invoking the resource shrinker

Bug: 246217952
Test: m
Change-Id: I2e7851af1189db2a6adf6f9f9f444a1d7f3a8d60

java/resourceshrinker.go

@@ -0,0 +1,43 @@
+// Copyright 2022 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package java
+
+import (
+	"android/soong/android"
+
+	"github.com/google/blueprint"
+)
+
+var shrinkResources = pctx.AndroidStaticRule("shrinkResources",
+	blueprint.RuleParams{
+		Command:     `${config.ResourceShrinkerCmd} --output $out --input $in --raw_resources $raw_resources`,
+		CommandDeps: []string{"${config.ResourceShrinkerCmd}"},
+	}, "raw_resources")
+
+func ShrinkResources(ctx android.ModuleContext, apk android.Path, outputFile android.WritablePath) {
+	protoFile := android.PathForModuleOut(ctx, apk.Base()+".proto.apk")
+	aapt2Convert(ctx, protoFile, apk, "proto")
+	strictModeFile := android.PathForSource(ctx, "prebuilts/cmdline-tools/shrinker.xml")
+	protoOut := android.PathForModuleOut(ctx, apk.Base()+".proto.out.apk")
+	ctx.Build(pctx, android.BuildParams{
+		Rule:   shrinkResources,
+		Input:  protoFile,
+		Output: protoOut,
+		Args: map[string]string{
+			"raw_resources": strictModeFile.String(),
+		},
+	})
+	aapt2Convert(ctx, outputFile, protoOut, "binary")
+}