Add bloaty package

This package can be used by other binary generator to gather the section
sizes at build time. It uses bloaty_merger to export all the measured
data into a single proto file.

Bug: 172339742
Test: m out/soong/binary_sizes.pb
Change-Id: I0ca87cdb2fb8b77226e79d9dcd762abe64aeea51
diff --git a/bloaty/Android.bp b/bloaty/Android.bp
index 0c4f603..b1f1e39 100644
--- a/bloaty/Android.bp
+++ b/bloaty/Android.bp
@@ -1,3 +1,16 @@
+bootstrap_go_package {
+    name: "soong-bloaty",
+    pkgPath: "android/soong/bloaty",
+    deps: [
+        "blueprint",
+        "soong-android",
+    ],
+    srcs: [
+        "bloaty.go",
+    ],
+    pluginFor: ["soong_build"],
+}
+
 python_test_host {
     name: "bloaty_merger_test",
     srcs: [