UMA stats to count RenderFrameProxyHosts

content/browser/frame_host/render_frame_host_manager.h

 // Copyright 2013 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 CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 465 matching lines @@
   // |outer_contents_site_instance|. The frame in outer WebContents that is
   // hosting the inner WebContents is |render_frame_host|, and the frame will
   // be swapped out with the proxy.
   void CreateOuterDelegateProxy(SiteInstance* outer_contents_site_instance,
                                 RenderFrameHostImpl* render_frame_host);
 
   // Sets the child RenderWidgetHostView for this frame, which must be part of
   // an inner WebContents.
   void SetRWHViewForInnerContents(RenderWidgetHostView* child_rwhv);
 
+  // Returns the number of RenderFrameProxyHosts for this frame.
+  int GetProxyCount();
+
   // Returns a copy of the map of proxy hosts. The keys are SiteInstance IDs,
   // the values are RenderFrameProxyHosts.
   std::map<int, RenderFrameProxyHost*> GetAllProxyHostsForTesting();
 
   // SiteInstanceImpl::Observer
   void ActiveFrameCountIsZero(SiteInstanceImpl* site_instance) override;
   void RenderProcessGone(SiteInstanceImpl* site_instance) override;
 
  private:
   friend class NavigatorTestWithBrowserSideNavigation;
@@ skipping 278 matching lines @@
   scoped_ptr<RenderFrameHostImpl> speculative_render_frame_host_;
 
   base::WeakPtrFactory<RenderFrameHostManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_