renderer: implement multiple permission requesting

content/child/permissions/permission_dispatcher.cc

Index: content/child/permissions/permission_dispatcher.cc
diff --git a/content/child/permissions/permission_dispatcher.cc b/content/child/permissions/permission_dispatcher.cc
index 3e7912697678e10f1cf1141b283f63280607a138..c9a67781a741d6600f8f2208af49c4daf98c270c 100644
--- a/content/child/permissions/permission_dispatcher.cc
+++ b/content/child/permissions/permission_dispatcher.cc
@@ -102,6 +102,14 @@ void PermissionDispatcher::requestPermission(
       type, origin.string().utf8(), callback, kNoWorkerThread);
 }
 
+void PermissionDispatcher::requestPermissions(
+    const blink::WebVector<blink::WebPermissionType>& types,
+    const blink::WebURL& origin,
+    blink::WebPermissionsCallback* callback) {
+  RequestPermissionsInternal(
+      types, origin.string().utf8(), callback, kNoWorkerThread);
+}
+
 void PermissionDispatcher::revokePermission(
     blink::WebPermissionType type,
     const blink::WebURL& origin,
@@ -151,6 +159,14 @@ void PermissionDispatcher::RequestPermissionForWorker(
   RequestPermissionInternal(type, origin, callback, worker_thread_id);
 }
 
+void PermissionDispatcher::RequestPermissionsForWorker(
+    const blink::WebVector<blink::WebPermissionType>& types,
+    const std::string& origin,
+    blink::WebPermissionsCallback* callback,
+    int worker_thread_id) {
+  RequestPermissionsInternal(types, origin, callback, worker_thread_id);
+}
+
 void PermissionDispatcher::RevokePermissionForWorker(
     blink::WebPermissionType type,
     const std::string& origin,
@@ -202,6 +218,13 @@ void PermissionDispatcher::RunCallbackOnWorkerThread(
   delete callback;
 }
 
+void PermissionDispatcher::RunMultiCallbackOnWorkerThread(
+    blink::WebPermissionsCallback* callback,
+    scoped_ptr<blink::WebVector<blink::WebPermissionStatus>> statuses) {
+  callback->onSuccess(blink::adoptWebPtr(statuses.release()));
+  delete callback;
+}
+
 PermissionServicePtr& PermissionDispatcher::GetPermissionServicePtr() {
   if (!permission_service_.get()) {
     service_registry_->ConnectToRemoteService(
@@ -255,6 +278,33 @@ void PermissionDispatcher::RequestPermissionInternal(
                  callback_key));
 }
 
+void PermissionDispatcher::RequestPermissionsInternal(
+    const blink::WebVector<blink::WebPermissionType>& types,
+    const std::string& origin,
+    blink::WebPermissionsCallback* callback,
+    int worker_thread_id) {
+  // We need to save the |callback| in an ScopedVector so if |this| gets
+  // deleted, the callback will not leak. In the case of |this| gets deleted,
+  // the |permission_service_| pipe will be destroyed too so OnQueryPermission
+  // will not be called.
+  uintptr_t callback_key = reinterpret_cast<uintptr_t>(callback);
+  batch_pending_callbacks_.add(callback_key,
+      scoped_ptr<blink::WebPermissionsCallback>(callback));
+
+  mojo::Array<PermissionName> names(types.size());
+  for (size_t i = 0; i < types.size(); ++i)
+    names[i] = GetPermissionName(types[i]);
+
+  GetPermissionServicePtr()->RequestBatchPermission(
+      names.Pass(),
+      origin,
+      blink::WebUserGestureIndicator::isProcessingUserGesture(),
+      base::Bind(&PermissionDispatcher::OnPermissionsResponse,
+                 base::Unretained(this),
+                 worker_thread_id,
+                 callback_key));
+}
+
 void PermissionDispatcher::RevokePermissionInternal(
     blink::WebPermissionType type,
     const std::string& origin,
@@ -303,6 +353,35 @@ void PermissionDispatcher::OnPermissionResponse(
   pending_callbacks_.erase(callback_key);
 }
 
+void PermissionDispatcher::OnPermissionsResponse(
+    int worker_thread_id,
+    uintptr_t callback_key,
+    const mojo::Array<PermissionStatus>& result) {
+  blink::WebPermissionsCallback* callback =
+      batch_pending_callbacks_.get(callback_key);
+  scoped_ptr<blink::WebVector<blink::WebPermissionStatus>> statuses(
+      new blink::WebVector<blink::WebPermissionStatus>(result.size()));
+
+  for (size_t i = 0; i < result.size(); i++)
+    statuses->operator[](i) = GetWebPermissionStatus(result[i]);
+
+  if (worker_thread_id != kNoWorkerThread) {
+    batch_pending_callbacks_.take_and_erase(callback_key);
+
+    // If the worker is no longer running, ::PostTask() will return false and
+    // gracefully fail, destroying the callback too.
+    WorkerTaskRunner::Instance()->PostTask(
+        worker_thread_id,
+        base::Bind(&PermissionDispatcher::RunMultiCallbackOnWorkerThread,
+                   base::Unretained(callback),
+                   base::Passed(&statuses)));
+    return;
+  }
+
+  callback->onSuccess(blink::adoptWebPtr(statuses.release()));
+  batch_pending_callbacks_.erase(callback_key);
+}
+
 void PermissionDispatcher::OnPermissionChanged(
     blink::WebPermissionType type,
     const std::string& origin,