[Contextual Search] Add Mojo-enabled API component.

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 0db8e4144ce617af19dc943a8f2b9e1a24876785..6dc15377d9a1cde1134d9c580481eff9d1a9d17d 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -57,6 +57,7 @@
 #include "components/autofill/content/renderer/password_autofill_agent.h"
 #include "components/autofill/content/renderer/password_generation_agent.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
+#include "components/contextual_search/renderer/overlay_js_render_frame_observer.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_headers.h"
 #include "components/dom_distiller/content/renderer/distillability_agent.h"
 #include "components/dom_distiller/content/renderer/distiller_js_render_frame_observer.h"
@@ -535,6 +536,9 @@ void ChromeContentRendererClient::RenderFrameCreated(
   // DistillabilityDriver in the browser process.
   new dom_distiller::DistillabilityAgent(render_frame);
 
+  // Set up a mojo service to test if this page is a contextual search page.
+  new contextual_search::OverlayJsRenderFrameObserver(render_frame);
+
   PasswordAutofillAgent* password_autofill_agent =
       new PasswordAutofillAgent(render_frame);
   PasswordGenerationAgent* password_generation_agent =