Soong frontend for shared library fuzzing.

Additional context (for Googlers): go/android-fuzzing-shared

This patch adds the Soong frontend for shared library fuzzing. We
traverse dependencies at soong install time to find all transient shared
libraries that $module depends on. We then ask the Make backend to
depend on the shared library.

We also create the source:destination mappings between where the shared
libraries are built to where they should be installed to for fuzzing.
This is then depended on by the Make backend.

Bug: N/A
Test: m fuzz, note the contents of $ANDROID_PRODUCT_OUT/data/fuzz/lib,
and out/soong/fuzz-target-*.zip now has shared libraries.

Change-Id: Id7afbd34bc9c055110af96cd3c668b730d404aee
diff --git a/cc/androidmk.go b/cc/androidmk.go
index 91a3c99..ff181d8 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -327,14 +327,15 @@
 			filepath.Dir(fuzz.config.String())+":config.json")
 	}
 
-	if len(fuzzFiles) > 0 {
-		ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
-			fmt.Fprintln(w, "LOCAL_TEST_DATA := "+strings.Join(fuzzFiles, " "))
-		})
-	}
-
 	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
 		fmt.Fprintln(w, "LOCAL_IS_FUZZ_TARGET := true")
+		if len(fuzzFiles) > 0 {
+			fmt.Fprintln(w, "LOCAL_TEST_DATA := "+strings.Join(fuzzFiles, " "))
+		}
+		if fuzz.installedSharedDeps != nil {
+			fmt.Fprintln(w, "LOCAL_FUZZ_INSTALLED_SHARED_DEPS :="+
+				strings.Join(fuzz.installedSharedDeps, " "))
+		}
 	})
 }