Add support for building with R8 full mode

Change-Id: Ibb6fd64e8901cb4311b29b3bbb266ec8fd1835c9
Test: make external/libtextclassifier

java/dex.go

@@ -38,6 +38,10 @@ type DexProperties struct {
 		// True if the module containing this has it set by default.
 		EnabledByDefault bool `blueprint:"mutated"`
 
+		// If true, runs R8 in Proguard compatibility mode (default).
+		// Otherwise, runs R8 in full mode.
+		Proguard_compatibility *bool
+
 		// If true, optimize for size by removing unused code.  Defaults to true for apps,
 		// false for libraries and tests.
 		Shrink *bool
@@ -113,7 +117,6 @@ var r8, r8RE = remoteexec.MultiCommandStaticRules(pctx, "r8",
 			`rm -f "$outDict" && rm -rf "${outUsageDir}" && ` +
 			`mkdir -p $$(dirname ${outUsage}) && ` +
 			`$r8Template${config.R8Cmd} ${config.DexFlags} -injars $in --output $outDir ` +
-			`--force-proguard-compatibility ` +
 			`--no-data-resources ` +
 			`-printmapping ${outDict} ` +
 			`-printusage ${outUsage} ` +
@@ -230,6 +233,10 @@ func (d *dexer) r8Flags(ctx android.ModuleContext, flags javaBuilderFlags) (r8Fl
 
 	r8Flags = append(r8Flags, opt.Proguard_flags...)
 
+	if BoolDefault(opt.Proguard_compatibility, true) {
+		r8Flags = append(r8Flags, "--force-proguard-compatibility")
+	}
+
 	// TODO(ccross): Don't shrink app instrumentation tests by default.
 	if !Bool(opt.Shrink) {
 		r8Flags = append(r8Flags, "-dontshrink")