Expands the chrome.experimental.processes extension API....

chrome/browser/extensions/extension_message_service.cc

Index: chrome/browser/extensions/extension_message_service.cc
===================================================================
--- chrome/browser/extensions/extension_message_service.cc	(revision 61514)
+++ chrome/browser/extensions/extension_message_service.cc	(working copy)
@@ -10,6 +10,8 @@
 #include "base/values.h"
 #include "chrome/browser/child_process_security_policy.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
+#include "chrome/browser/extensions/extension_processes_api.h"
+#include "chrome/browser/extensions/extension_processes_api_constants.h"
 #include "chrome/browser/extensions/extension_tabs_module.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/renderer_host/render_process_host.h"
@@ -174,10 +176,22 @@
     extension_devtools_manager_->AddEventListener(event_name,
                                                   render_process_id);
   }
+
+  // We lazily tell the TaskManager to start updating when listeners to the
+  // processes.onUpdated event arrive.
+  if (event_name.compare(extension_processes_api_constants::kOnUpdated) == 0) {
+    ExtensionProcessesEventRouter::GetInstance()->ListenerAdded();
+  }
 }
 
 void ExtensionMessageService::RemoveEventListener(const std::string& event_name,
                                                   int render_process_id) {
+  // If a processes.onUpdated event listener is removed (or a process with one
+  // exits), then we let the TaskManager know that it has one fewer listener.
+  if (event_name.compare(extension_processes_api_constants::kOnUpdated) == 0) {
+    ExtensionProcessesEventRouter::GetInstance()->ListenerRemoved();
+  }
+
   // The RenderProcessHost may be destroyed. See AddEventListener.
   RenderProcessHost* rph = RenderProcessHost::FromID(render_process_id);
   if (!rph || rph->ListenersIterator().IsAtEnd())