Allow direct and indirect navigation values to be varied via field trial.

chrome/browser/banners/app_banner_manager.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_
 #define CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 14 matching lines @@
  *
  * Hooks the wiring together for getting the data for a particular app.
  * Monitors at most one app at a time, tracking the info for the most recently
  * requested app. Any work in progress for other apps is discarded.
  */
 class AppBannerManager : public content::WebContentsObserver,
                          public AppBannerDataFetcher::Delegate {
  public:
   static void DisableSecureSchemeCheckForTesting();
 
-  static void ForceEngagementWeightsForTesting(double direct_engagement,
-                                               double indirect_engagement);
+  static void SetEngagementWeights(double direct_engagement,
+                                   double indirect_engagement);
 
   // Returns whether or not the URLs match for everything except for the ref.
   static bool URLsAreForTheSamePage(const GURL& first, const GURL& second);
 
   explicit AppBannerManager(int icon_size);
   ~AppBannerManager() override;
 
   // WebContentsObserver overrides.
   void DidCommitProvisionalLoadForFrame(
       content::RenderFrameHost* render_frame_host,
@@ skipping 48 matching lines @@
   // longer than the lifetime of this banner manager. The banner manager
   // might be gone when calls sent to the ServiceWorkerContext are completed.
   base::WeakPtrFactory<AppBannerManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppBannerManager);
 };  // class AppBannerManager
 
 }  // namespace banners
 
 #endif  // CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_