Translate SDK level 10000 to a valid compiler min-api

Targets with the special level 10000 are compiled using the current
platform SDK level. They are also compiled as a "platform build" which
will disable features such as API modeling and method backports.

Bug: 295591477
Test: manual inspection of the updated build commands
Change-Id: Ifda8859396b33dde4c46a9b212ddb855b012bf07

java/dex.go

@@ -217,8 +217,9 @@ func (d *dexer) dexCommonFlags(ctx android.ModuleContext,
 	// Note: Targets with a min SDK kind of core_platform (e.g., framework.jar) or unspecified (e.g.,
 	// services.jar), are not classified as stable, which is WAI.
 	// TODO(b/232073181): Expand to additional min SDK cases after validation.
+	var addAndroidPlatformBuildFlag = false
 	if !dexParams.sdkVersion.Stable() {
-		flags = append(flags, "--android-platform-build")
+		addAndroidPlatformBuildFlag = true
 	}
 
 	effectiveVersion, err := dexParams.minSdkVersion.EffectiveVersion(ctx)
@@ -226,7 +227,18 @@ func (d *dexer) dexCommonFlags(ctx android.ModuleContext,
 		ctx.PropertyErrorf("min_sdk_version", "%s", err)
 	}
 
-	flags = append(flags, "--min-api "+strconv.Itoa(effectiveVersion.FinalOrFutureInt()))
+	// If the specified SDK level is 10000, then configure the compiler to use the
+	// current platform SDK level and to compile the build as a platform build.
+	var minApiFlagValue = effectiveVersion.FinalOrFutureInt()
+	if minApiFlagValue == 10000 {
+		minApiFlagValue = ctx.Config().PlatformSdkVersion().FinalInt()
+		addAndroidPlatformBuildFlag = true
+	}
+	flags = append(flags, "--min-api "+strconv.Itoa(minApiFlagValue))
+
+	if addAndroidPlatformBuildFlag {
+		flags = append(flags, "--android-platform-build")
+	}
 	return flags, deps
 }