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

content/browser/renderer_host/render_process_host_impl.cc

 // 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 625 matching lines @@
   }
 
   if (!gpu_observer_registered_) {
     gpu_observer_registered_ = true;
     GpuDataManagerImpl::GetInstance()->AddObserver(this);
   }
 
   power_monitor_broadcaster_.Init();
 
   is_initialized_ = true;
+  init_time_ = base::TimeTicks::Now();
   return true;
 }
 
 void RenderProcessHostImpl::MaybeActivateMojo() {
   // TODO(darin): Following security review, we can unconditionally initialize
   // Mojo in all renderers. We will then be able to directly call Activate()
   // from OnProcessLaunched.
   if (!mojo_activation_required_)
     return;  // Waiting on someone to require Mojo.
 
@@ skipping 1596 matching lines @@
   if (worker_ref_count_ == 0)
     Cleanup();
 }
 
 void RenderProcessHostImpl::EnsureMojoActivated() {
   mojo_activation_required_ = true;
   MaybeActivateMojo();
 }
 
 }  // namespace content