Snapshot of all changes to get jumbo in blink and content.

content/public/child/BUILD.gn

Index: content/public/child/BUILD.gn
diff --git a/content/public/child/BUILD.gn b/content/public/child/BUILD.gn
index 36a015582806d7a0a1c0171a248c32f72355a81a..94d841f80d2d3754bbc4f7f00ac311cb0d7dd73d 100644
--- a/content/public/child/BUILD.gn
+++ b/content/public/child/BUILD.gn
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import("//ppapi/features/features.gni")
+import("//content/content.gni")
 
 # See //content/BUILD.gn for how this works.
 group("child") {
@@ -23,7 +24,7 @@ group("child") {
   }
 }
 
-source_set("child_sources") {
+content_source_set("child_sources") {
   # External code should depend in via ":child" above.
   visibility = [ "//content/*" ]