[headless] Make browser service manifest overlay configurable.

headless/public/headless_browser.h

Index: headless/public/headless_browser.h
diff --git a/headless/public/headless_browser.h b/headless/public/headless_browser.h
index 954b79e0db4609324864c8ef209bbf7db28be0d8..c21bad7b3fc9272ad155987c099c57c8dc087926 100644
--- a/headless/public/headless_browser.h
+++ b/headless/public/headless_browser.h
@@ -115,6 +115,11 @@ struct HeadlessBrowser::Options {
   // string can be used to disable GL rendering (e.g., WebGL support).
   std::string gl_implementation;
 
+  // Resource identifier of a service manifest.json file that includes interface
+  // provider specs for mojo services that the browser exposes to the renderers.
+  // For an example, see headless/lib/embedder_test_manifest_overlay.json.
+  int mojo_service_manifest_resource_id;

[Sami, 2016/11/09 18:35:52]

Looks uninitialized?

+
   // Default per-context options, can be specialized on per-context basis.
 
   std::string user_agent;
@@ -159,6 +164,7 @@ class HeadlessBrowser::Options::Builder {
   Builder& SetSingleProcessMode(bool single_process_mode);
   Builder& SetDisableSandbox(bool disable_sandbox);
   Builder& SetGLImplementation(const std::string& gl_implementation);
+  Builder& SetMojoServiceManifestResourceId(int resource_id);
 
   // Per-context settings.