Reland of Fixing package-boundary violation with srjar_deps

webrtc/build/webrtc.gni

Index: webrtc/build/webrtc.gni
diff --git a/webrtc/build/webrtc.gni b/webrtc/build/webrtc.gni
index ce598715766df14aeee12ded981f3fccf2415d9f..8a460f5d7ecc457a97a9e43b94c80baa305e048f 100644
--- a/webrtc/build/webrtc.gni
+++ b/webrtc/build/webrtc.gni
@@ -324,3 +324,32 @@ template("rtc_shared_library") {
     }
   }
 }
+
+# TODO(mbonadei): Merge this in android_library or create an
+# rtc_android_library. Waiting for hints from chromium:648244.
+if (is_android) {
+  template("android_shared_srcjar") {
+    action(target_name) {
+      check_includes = false
+      set_sources_assignment_filter([])
+      assert(defined(invoker.sources))
+
+      forward_variables_from(invoker,
+                             [
+                               "sources",
+                               "testonly",
+                               "visibility",
+                             ])
+      script = "//webrtc/build/generate_srcjar.py"
+      _srcjar_path = "${target_gen_dir}/${target_name}.srcjar"
+      _rebased_srcjar_path = rebase_path(_srcjar_path, root_build_dir)
+      _rebased_sources = rebase_path(invoker.sources, root_build_dir)
+
+      args = [ "--srcjar=$_rebased_srcjar_path" ] + _rebased_sources
+
+      outputs = [
+        _srcjar_path,
+      ]
+    }
+  }
+}