Permissions: glue between Mojo and Blink for permission observing.

content/child/permissions/permission_dispatcher_thread_proxy.h

Index: content/child/permissions/permission_dispatcher_thread_proxy.h
diff --git a/content/child/permissions/permission_dispatcher_thread_proxy.h b/content/child/permissions/permission_dispatcher_thread_proxy.h
index c5273355000bf6d3f271ecf1ece5e8e5f03ad608..65d07eb514bf72d0dd5148ae8d54fd0725cde9a1 100644
--- a/content/child/permissions/permission_dispatcher_thread_proxy.h
+++ b/content/child/permissions/permission_dispatcher_thread_proxy.h
@@ -5,10 +5,10 @@
 #ifndef CONTENT_CHILD_PERMISSIONS_PERMISSION_DISPATCHER_THREAD_PROXY_H_
 #define CONTENT_CHILD_PERMISSIONS_PERMISSION_DISPATCHER_THREAD_PROXY_H_
 
-#include "base/compiler_specific.h"
 #include "base/id_map.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "content/child/permissions/permission_observers_registry.h"
 #include "content/child/worker_task_runner.h"
 #include "third_party/WebKit/public/platform/modules/permissions/WebPermissionClient.h"
 
@@ -20,8 +20,12 @@ namespace content {
 
 class PermissionDispatcher;
 
+// PermissionDispatcherThreadProxy is a a proxy to the PermissionDispatcher for
+// callers running on a different thread than the main thread. There is one
+// instance of that class per thread.
 class PermissionDispatcherThreadProxy :
     public blink::WebPermissionClient,
+    public PermissionObserversRegistry,
     public WorkerTaskRunner::Observer {
  public:
   static PermissionDispatcherThreadProxy* GetThreadInstance(
@@ -32,6 +36,10 @@ class PermissionDispatcherThreadProxy :
   virtual void queryPermission(blink::WebPermissionType type,
                                const blink::WebURL& origin,
                                blink::WebPermissionQueryCallback* callback);
+  virtual void startListening(blink::WebPermissionType type,
+                              const blink::WebURL& origin,
+                              blink::WebPermissionObserver* observer);
+  virtual void stopListening(blink::WebPermissionObserver* observer);
 
   // WorkerTaskRunner::Observer implementation.
   void OnWorkerRunLoopStopped() override;
@@ -41,6 +49,12 @@ class PermissionDispatcherThreadProxy :
       base::SingleThreadTaskRunner* main_thread_task_runner,
       PermissionDispatcher* permissions_dispatcher);
 
+  // Callback when an observed permission changes.
+  void OnPermissionChanged(blink::WebPermissionType type,
+                           const std::string& origin,
+                           blink::WebPermissionObserver* observer,
+                           blink::WebPermissionStatus status);
+
   virtual ~PermissionDispatcherThreadProxy();
 
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;