Add android_app_import.

This is an initial version that handles the most basic cases.

Bug: 128610294
Test: app_test.go + prebuilt webview.apk
Change-Id: Ic525559aad5612987e50aa75b326b77b23acb716
diff --git a/java/dexpreopt.go b/java/dexpreopt.go
index b502d07..a7938c8 100644
--- a/java/dexpreopt.go
+++ b/java/dexpreopt.go
@@ -22,11 +22,12 @@
 type dexpreopter struct {
 	dexpreoptProperties DexpreoptProperties
 
-	installPath     android.OutputPath
-	uncompressedDex bool
-	isSDKLibrary    bool
-	isTest          bool
-	isInstallable   bool
+	installPath         android.OutputPath
+	uncompressedDex     bool
+	isSDKLibrary        bool
+	isTest              bool
+	isInstallable       bool
+	isPresignedPrebuilt bool
 
 	builtInstalled string
 }
@@ -177,6 +178,8 @@
 		NoCreateAppImage:    !BoolDefault(d.dexpreoptProperties.Dex_preopt.App_image, true),
 		ForceCreateAppImage: BoolDefault(d.dexpreoptProperties.Dex_preopt.App_image, false),
 
+		PresignedPrebuilt: d.isPresignedPrebuilt,
+
 		NoStripping:     Bool(d.dexpreoptProperties.Dex_preopt.No_stripping),
 		StripInputPath:  dexJarFile,
 		StripOutputPath: strippedDexJarFile.OutputPath,