Implement PermissionService::GetNextPermissionChange.

content/child/permissions/permission_manager.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/child/permissions/permission_manager.h"
+
+#include "content/child/worker_task_runner.h"
+#include "content/public/common/service_registry.h"
+#include "third_party/WebKit/public/platform/WebURL.h"
+
+namespace content {
+
+namespace {
+
+PermissionName GetPermissionName(blink::WebPermissionType type) {
+  switch (type) {
+    case blink::WebPermissionTypeGeolocation:
+      return PERMISSION_NAME_GEOLOCATION;
+    case blink::WebPermissionTypeNotifications:
+      return PERMISSION_NAME_NOTIFICATIONS;
+    case blink::WebPermissionTypePushNotifications:
+      return PERMISSION_NAME_PUSH_NOTIFICATIONS;
+    case blink::WebPermissionTypeMidiSysEx:
+      return PERMISSION_NAME_MIDI_SYSEX;
+    default:
+      // The default statement is only there to prevent compilation failures if

[Bernhard Bauer, 2015/03/23 10:20:43]

Uh, if WebPermissionType does in fact get extended without this switch being
updated, I think a compilation failure would be pretty good to draw attention to
that.

+      // WebPermissionType enum gets extended.
+      NOTREACHED();
+      return PERMISSION_NAME_GEOLOCATION;
+  }
+}
+
+blink::WebPermissionStatus GetWebPermissionStatus(PermissionStatus status) {
+  switch (status) {
+    case PERMISSION_STATUS_GRANTED:
+      return blink::WebPermissionStatusGranted;
+    case PERMISSION_STATUS_DENIED:
+      return blink::WebPermissionStatusDenied;
+    case PERMISSION_STATUS_ASK:
+      return blink::WebPermissionStatusPrompt;
+  }
+}
+
+const int kNoWorkerThread = 0;
+
+}  // anonymous namespace
+
+PermissionManager::CallbackInformation::CallbackInformation(
+    blink::WebPermissionQueryCallback* callback,
+    int worker_thread_id)
+  : callback_(callback),
+    worker_thread_id_(worker_thread_id) {
+}
+
+blink::WebPermissionQueryCallback*
+PermissionManager::CallbackInformation::callback() const {
+  return callback_.get();
+}
+
+int PermissionManager::CallbackInformation::worker_thread_id() const {
+  return worker_thread_id_;
+}
+
+blink::WebPermissionQueryCallback*
+PermissionManager::CallbackInformation::ReleaseCallback() {
+  return callback_.release();
+}
+
+PermissionManager::CallbackInformation::~CallbackInformation() {
+}
+
+PermissionManager::PermissionManager(ServiceRegistry& service_registry) {
+  service_registry.ConnectToRemoteService(&permission_service_);
+}
+
+PermissionManager::~PermissionManager() {
+}
+
+void PermissionManager::queryPermission(
+    blink::WebPermissionType type,
+    const blink::WebURL& origin,
+    blink::WebPermissionQueryCallback* callback) {
+  QueryPermissionInternal(
+      type, origin.string().utf8(), callback, kNoWorkerThread);
+}
+
+void PermissionManager::QueryPermissionForWorker(
+    blink::WebPermissionType type,
+    const std::string& origin,
+    blink::WebPermissionQueryCallback* callback,
+    int worker_thread_id) {
+  QueryPermissionInternal(type, origin, callback, worker_thread_id);
+}
+
+void PermissionManager::QueryPermissionInternal(
+    blink::WebPermissionType type,
+    const std::string& origin,
+    blink::WebPermissionQueryCallback* callback,
+    int worker_thread_id) {
+  // We need to save the |callback| in an IDMap so if |this| gets deleted, the
+  // callback will not leak. In the case of |this| gets deleted, the

[Bernhard Bauer, 2015/03/23 10:20:43]

s/In the case of/In case/ (or "In the case of |this| getting deleted").

+  // |permission_service_| pipe will be destroyed too so OnQueryPermission will
+  // not be called.
+  int request_id = pending_callbacks_.Add(
+      new CallbackInformation(callback, worker_thread_id));
+  permission_service_->HasPermission(
+      GetPermissionName(type),
+      origin,
+      base::Bind(&PermissionManager::OnQueryPermission,
+                 base::Unretained(this),
+                 request_id));
+}
+
+void PermissionManager::OnQueryPermission(int request_id,
+                                           PermissionStatus result) {
+  CallbackInformation* callback_information =
+      pending_callbacks_.Lookup(request_id);
+  DCHECK(callback_information && callback_information->callback());
+  scoped_ptr<blink::WebPermissionStatus> status(
+      new blink::WebPermissionStatus(GetWebPermissionStatus(result)));
+
+  if (callback_information->worker_thread_id() != kNoWorkerThread) {
+    blink::WebPermissionQueryCallback* callback =
+        callback_information->ReleaseCallback();
+    int worker_thread_id = callback_information->worker_thread_id();
+    pending_callbacks_.Remove(request_id);
+
+    // If the worker is no longer running, ::PostTask() will return false and
+    // gracefully fail, destroying the callback too.

[Bernhard Bauer, 2015/03/23 10:20:43]

I don't understand this comment. The return value of PostTask is not checked.
And which callback is this about? The |callback| variable or the closure bound
below?

+    WorkerTaskRunner::Instance()->PostTask(
+        worker_thread_id,
+        base::Bind(&PermissionManager::RunCallbackOnWorkerThread,
+                   base::Unretained(callback),

[Bernhard Bauer, 2015/03/23 10:20:43]

Could you pass this base::Owned or in a scoped_ptr?

+                   base::Passed(&status)));
+    return;
+  }
+
+  callback_information->callback()->onSuccess(status.release());
+  pending_callbacks_.Remove(request_id);
+}
+
+// static
+void PermissionManager::RunCallbackOnWorkerThread(
+    blink::WebPermissionQueryCallback* callback,
+    scoped_ptr<blink::WebPermissionStatus> status) {
+  callback->onSuccess(status.release());
+  delete callback;
+}
+
+}  // namespace content