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

content/browser/renderer_host/render_process_host_impl.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_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 
 #include <map>
 #include <queue>
 #include <string>
@@ skipping 241 matching lines @@
   void IncrementWorkerRefCount();
   void DecrementWorkerRefCount();
 
   // Call this function to resume the navigation when it was deferred
   // immediately after receiving response headers.
   void ResumeResponseDeferredAtStart(const GlobalRequestID& request_id);
 
   // Activates Mojo for this process. Does nothing if Mojo is already activated.
   void EnsureMojoActivated();
 
+  // PlzNavigate
+  // Returns the time the first call to Init completed successfully (after a new
+  // renderer process was created); further calls to Init won't change this
+  // value.
+  // Note: Will disappear after PlzNavitate is completed.
+  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)
   scoped_ptr<IPC::ChannelProxy> channel_;
 
   // A host object ChannelMojo needs. The lifetime is bound to
   // the RenderProcessHostImpl, not the channel.
   scoped_ptr<IPC::ChannelMojoHost> channel_mojo_host_;
 
   // True if fast shutdown has been performed on this RPH.
@@ skipping 92 matching lines @@
   // The filter for MessagePort messages coming from the renderer.
   scoped_refptr<MessagePortMessageFilter> message_port_message_filter_;
 
   // Used in single-process mode.
   scoped_ptr<base::Thread> in_process_renderer_;
 
   // True after Init() has been called. We can't just check channel_ because we
   // 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_;
 
   // Messages we queue while waiting for the process handle.  We queue them here
   // instead of in the channel so that we ensure they're sent after init related
   // messages that are sent once the process handle is available.  This is
   // because the queued messages may have dependencies on the init messages.
   std::queue<IPC::Message*> queued_messages_;
 
   // The globally-unique identifier for this RPH.
@@ skipping 72 matching lines @@
   base::TimeTicks survive_for_worker_start_time_;
 
   base::WeakPtrFactory<RenderProcessHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_