webapk: Avoid overwriting default CreationParams

content/browser/browsing_instance.h

Index: content/browser/browsing_instance.h
diff --git a/content/browser/browsing_instance.h b/content/browser/browsing_instance.h
index 34c1f073bbd852c260aecf8eade45656d6d10005..9e3dfe5126281e275a5ae9d7aa09a60abd34a0ae 100644
--- a/content/browser/browsing_instance.h
+++ b/content/browser/browsing_instance.h
@@ -65,13 +65,16 @@ class CONTENT_EXPORT BrowsingInstance final
                            OneSiteInstancePerSiteInBrowserContext);
 
   // Create a new BrowsingInstance.
-  explicit BrowsingInstance(BrowserContext* context);
+  BrowsingInstance(BrowserContext* context, int child_process_param_id);
 
   ~BrowsingInstance();
 
   // Get the browser context to which this BrowsingInstance belongs.
   BrowserContext* browser_context() const { return browser_context_; }
 
+  // An opaque id used passed to ChildProcessLauncher to launch child processes.
+  int child_process_param_id() const { return child_process_param_id_; }
+
   // Returns whether this BrowsingInstance has registered a SiteInstance for
   // the site of the given URL.
   bool HasSiteInstance(const GURL& url);
@@ -113,6 +116,8 @@ class CONTENT_EXPORT BrowsingInstance final
   // must belong.
   BrowserContext* const browser_context_;
 
+  const int child_process_param_id_;
+
   // Map of site to SiteInstance, to ensure we only have one SiteInstance per
   // site.  The site string should be the possibly_invalid_spec() of a GURL
   // obtained with SiteInstanceImpl::GetSiteForURL.  Note that this map may not