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 8a7936f8c8a2530a75371e599a35c6893160b4a8..d83dcd1c569b99055087a83b841ba2bd0510a767 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -311,6 +311,25 @@ 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,

[clamy, 2017/05/04 16:01:01]

Due to the split RenderProcessHostImpl/MockRenderProcessHost I had to make all
these methods static since I couldn't store state in the RenderProcessHostImpl
itself.

+                               RenderProcessHost* render_process_host,
+                               const GURL& site_url);

[Charlie Reis, 2017/05/15 03:41:52]

Note: If we call these parameters |site_url|, then we should expect them to
already be site URLs when passed in (rather than calling GetSiteURL internally).
 That might be easier if we track last_committed_site_url_ on RFHI.

[clamy, 2017/05/16 14:50:46]

Done.

+  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_;
@@ -409,6 +428,12 @@ class CONTENT_EXPORT RenderProcessHostImpl
       BrowserContext* browser_context,
       SiteInstanceImpl* site_instance);
 
+  // Returns a RenderProcessHost* that is rendering |site_url| in one of its
+  // 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);