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

content/public/browser/render_process_host.h

Index: content/public/browser/render_process_host.h
diff --git a/content/public/browser/render_process_host.h b/content/public/browser/render_process_host.h
index c1b5c47e1d2fd5b38f90dab5febc685e76c0a7a9..e55098d01a4016b5db1a8ba346c8e0e05ca7c2f0 100644
--- a/content/public/browser/render_process_host.h
+++ b/content/public/browser/render_process_host.h
@@ -20,6 +20,7 @@ struct ViewMsg_SwapOut_Params;
 
 namespace base {
 class TimeDelta;
+class TimeTicks;
 }
 
 namespace content {
@@ -229,6 +230,10 @@ class CONTENT_EXPORT RenderProcessHost : public IPC::Sender,
   // 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