[Contextual Search] Add Mojo-enabled API component.

chrome/browser/android/bottombar/overlay_panel_content.cc

Index: chrome/browser/android/bottombar/overlay_panel_content.cc
diff --git a/chrome/browser/android/bottombar/overlay_panel_content.cc b/chrome/browser/android/bottombar/overlay_panel_content.cc
index 300103d204f4ec96f638abe33e5ea86f0d09da02..464cc7f04673fb6bc416e9f73671b540f2e9e0be 100644
--- a/chrome/browser/android/bottombar/overlay_panel_content.cc
+++ b/chrome/browser/android/bottombar/overlay_panel_content.cc
@@ -20,6 +20,7 @@
 #include "components/variations/variations_associated_data.h"
 #include "components/web_contents_delegate_android/web_contents_delegate_android.h"
 #include "content/public/browser/android/content_view_core.h"
+#include "content/public/browser/render_process_host.h"
 #include "content/public/browser/web_contents.h"
 #include "jni/OverlayPanelContent_jni.h"
 #include "net/url_request/url_fetcher_impl.h"
@@ -107,11 +108,13 @@ void OverlayPanelContent::SetWebContents(JNIEnv* env,
   web_contents_->SetDelegate(web_contents_delegate_.get());
 }
 
-void OverlayPanelContent::DestroyWebContents(JNIEnv* env, jobject jobj) {
+int OverlayPanelContent::DestroyWebContents(JNIEnv* env, jobject jobj) {
   DCHECK(web_contents_.get());
+  int host_id = web_contents_->GetRenderProcessHost()->GetID();
   web_contents_.reset();
   // |web_contents_delegate_| may already be NULL at this point.
   web_contents_delegate_.reset();
+  return host_id;
 }
 
 void OverlayPanelContent::SetInterceptNavigationDelegate(