Changes PlzNavitate histograms to try and simplify their multi-modal characteristic.

content/public/browser/render_process_host.h

 // Copyright (c) 2012 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_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 
 #include "base/basictypes.h"
 #include "base/id_map.h"
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "base/supports_user_data.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_sender.h"
 #include "ui/gfx/native_widget_types.h"
 
 class GURL;
 struct ViewMsg_SwapOut_Params;
 
 namespace base {
 class TimeDelta;
+class TimeTicks;
 }
 
 namespace content {
 class BrowserContext;
 class BrowserMessageFilter;
 class RenderProcessHostObserver;
 class RenderWidgetHost;
 class ServiceRegistry;
 class StoragePartition;
 struct GlobalRequestID;
@@ skipping 189 matching lines @@
   // transferring it to a new renderer process.
   virtual void ResumeDeferredNavigation(const GlobalRequestID& request_id) = 0;
 
   // Notifies the renderer that the timezone configuration of the system might
   // have changed.
   virtual void NotifyTimezoneChange() = 0;
 
   // Returns the ServiceRegistry for this process.
   virtual ServiceRegistry* GetServiceRegistry() = 0;
 
+  // The time at which the first call to Init happened and the child renderer
+  // process was created.
+  virtual const base::TimeTicks& GetInitTime() const = 0;

[nasko, 2014/10/08 17:10:42]

Methods that are only used within content/ don't need to be put in the
content/public interface class. Even if we leave this method in the
implementation, please remove this.

[carlosk, 2014/10/09 16:53:45]

Done.

+
   // Static management functions -----------------------------------------------
 
   // Flag to run the renderer in process.  This is primarily
   // for debugging purposes.  When running "in process", the
   // browser maintains a single RenderProcessHost which communicates
   // to a RenderProcess which is instantiated in the same process
   // with the Browser.  All IPC between the Browser and the
   // Renderer is the same, it's just not crossing a process boundary.
 
   static bool run_renderer_in_process();
@@ skipping 38 matching lines @@
   static void SetMaxRendererProcessCount(size_t count);
 
   // Returns the current maximum number of renderer process hosts kept by the
   // content module.
   static size_t GetMaxRendererProcessCount();
 };
 
 }  // namespace content.
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_