PlzNavigate: implement process reuse for ServiceWorkers

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 1e4097edbd1158fbe7d11f75184a552ecef4f72f..6b09b6e13df37e775d1c0fca63097b672bd105dc 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -309,6 +309,25 @@ class CONTENT_EXPORT RenderProcessHostImpl
   static void set_render_process_host_factory(
       const RenderProcessHostFactory* rph_factory);
 
+  // Tracks which sites frames are hosted in which RenderProcessHosts.
+  static void AddFrameWithSite(BrowserContext* browser_context,
+                               RenderProcessHost* render_process_host,
+                               const GURL& site_url);
+  static void RemoveFrameWithSite(BrowserContext* browser_context,
+                                  RenderProcessHost* render_process_host,
+                                  const GURL& site_url);
+
+  // Tracks which sites navigations are expected to commit in which
+  // RenderProcessHosts.
+  static void AddExpectedNavigationToSite(
+      BrowserContext* browser_context,
+      RenderProcessHost* render_process_host,
+      const GURL& site_url);
+  static void RemoveExpectedNavigationToSite(
+      BrowserContext* browser_context,
+      RenderProcessHost* render_process_host,
+      const GURL& site_url);
+
  protected:
   // A proxy for our IPC::Channel that lives on the IO thread.
   std::unique_ptr<IPC::ChannelProxy> channel_;
@@ -415,6 +434,12 @@ class CONTENT_EXPORT RenderProcessHostImpl
       SiteInstanceImpl* site_instance,
       bool is_for_guests_only);
 
+  // Returns a RenderProcessHost* that is rendering |site_url| in one of its

[Charlie Reis, 2017/05/18 00:58:34]

nit: No need for the * here.

[clamy, 2017/05/22 16:59:52]

Done.

+  // frames, or that is expecting a navigation to |site_url|.
+  static RenderProcessHost* FindReusableProcessHostForSite(
+      BrowserContext* browser_context,
+      const GURL& site_url);
+
 #if BUILDFLAG(ENABLE_WEBRTC)
   void OnRegisterAecDumpConsumer(int id);
   void OnUnregisterAecDumpConsumer(int id);