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

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 53db06dc3bdfe0f0520a3257623d0569515ce9ce..82821b5d832331019407f12b0bae6c657cde360b 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -259,6 +259,13 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // Activates Mojo for this process. Does nothing if Mojo is already activated.
   void EnsureMojoActivated();
 
+  // PlzNavigate
+  // Getter for the time the first call to Init completed successfully (after a

[clamy, 2014/10/14 07:09:25]

nit: s/Getter for/Returns

[carlosk, 2014/10/14 09:03:27]

Done.

+  // new renderer process was created); further calls to Init won't change this
+  // value.
+  // NOTE: Will disappear after PlzNavitate is completed.

[clamy, 2014/10/14 07:09:25]

nit: s/NOTE/Note

[carlosk, 2014/10/14 09:03:27]

Done.

+  const base::TimeTicks& init_time() const { return init_time_; }
+
  protected:
   // A proxy for our IPC::Channel that lives on the IO thread (see
   // browser_process.h)
@@ -371,6 +378,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // also reset that in the case of process termination.
   bool is_initialized_;
 
+  // PlzNavigate
+  // Stores the time at which the first call to Init happened.
+  base::TimeTicks init_time_;
+
   // Used to launch and terminate the process without blocking the UI thread.
   scoped_ptr<ChildProcessLauncher> child_process_launcher_;