Make static (preloaded) security state generation part of the build process.

net/http/BUILD.gn

Index: net/http/BUILD.gn
diff --git a/net/http/BUILD.gn b/net/http/BUILD.gn
index 72f6d696d22f1036b1d9326aba624aab2996d131..e51061939fa3addbc41df6b73949e87c2e3e6d7e 100644
--- a/net/http/BUILD.gn
+++ b/net/http/BUILD.gn
@@ -4,6 +4,22 @@
 
 import("//build/compiled_action.gni")
 
+compiled_action("generate_transport_security_state") {
+  tool = "//net/tools/transport_security_state_generator"
+
+  # Inputs in order expected by the command line of the tool.
+  inputs = [
+    "transport_security_state_static.json",
+    "transport_security_state_static.pins",
+    "transport_security_state_static.template",
+  ]
+  outputs = [
+    "$target_gen_dir/transport_security_state_static.h",
+  ]
+  args =
+      rebase_path(inputs, root_build_dir) + rebase_path(outputs, root_build_dir)
+}
+
 compiled_action_foreach("transport_security_state_unittest_data") {
   tool = "//net/tools/transport_security_state_generator"
   sources = [