Expands the chrome.experimental.processes extension API.

Adds an onUpdated event that reports process metrics from the TaskManager,
and modifies the TaskManager to support multiple independent observers.

BUG=32302
TEST=ExtensionApiTest.Processes browsertest
TEST=process_monitor sample extension

Review URL: http://codereview.chromium.org/3597016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@62458 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 59 insertions, 1 deletions

diff --git a/chrome/browser/extensions/extension_processes_api.h b/chrome/browser/extensions/extension_processes_api.h
index b58cb56..497e0f6 100644
--- a/chrome/browser/extensions/extension_processes_api.h
+++ b/chrome/browser/extensions/extension_processes_api.h
@@ -6,14 +6,72 @@
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESSES_API_H__
 #pragma once
 
+#include <set>
+#include <string>
+
 #include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/task_manager/task_manager.h"
+#include "chrome/common/notification_observer.h"
+#include "chrome/common/notification_registrar.h"
+
+// Observes the Task Manager and routes the notifications as events to the
+// extension system.
+class ExtensionProcessesEventRouter : public TaskManagerModelObserver {
+ public:
+  // Single instance of the event router.
+  static ExtensionProcessesEventRouter* GetInstance();
+
+  // Safe to call multiple times.
+  void ObserveProfile(Profile* profile);
+
+  // Called when an extension process wants to listen to process events.
+  void ListenerAdded();
+
+  // Called when an extension process with a listener exits or removes it.
+  void ListenerRemoved();
+
+ private:
+  friend struct DefaultSingletonTraits<ExtensionProcessesEventRouter>;
+
+  ExtensionProcessesEventRouter();
+  virtual ~ExtensionProcessesEventRouter();
+
+  // TaskManagerModelObserver::OnModelChanged.
+  virtual void OnModelChanged() {}
+
+  // TaskManagerModelObserver::OnItemsChanged.
+  virtual void OnItemsChanged(int start, int length);
+
+  // TaskManagerModelObserver::OnItemsAdded.
+  virtual void OnItemsAdded(int start, int length) {}
+
+  // TaskManagerModelObserver::OnItemsRemoved.
+  virtual void OnItemsRemoved(int start, int length) {}
+
+  void DispatchEvent(Profile* profile,
+                     const char* event_name,
+                     const std::string& json_args);
+
+  // Used for tracking registrations to process related notifications.
+  NotificationRegistrar registrar_;
+
+  // Registered profiles.
+  typedef std::set<Profile*> ProfileSet;
+  ProfileSet profiles_;
+
+  // TaskManager to observe for updates.
+  TaskManagerModel* model_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionProcessesEventRouter);
+};
+
 
 // This extension function returns the Process object for the renderer process
 // currently in use by the specified Tab.
 class GetProcessForTabFunction : public SyncExtensionFunction {
   virtual ~GetProcessForTabFunction() {}
   virtual bool RunImpl();
-  DECLARE_EXTENSION_FUNCTION_NAME("experimental.processes.getProcessForTab")
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.processes.getProcessIdForTab")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESSES_API_H__