media: Add mojo MediaPermission service

content/browser/media/media_permission_impl.cc

+// Copyright 2016 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/browser/media/media_permission_impl.h"
+
+#include "content/browser/permissions/permission_service_context.h"
+#include "content/common/media/media_permission_dispatcher.h"
+#include "content/common/permission_service.mojom.h"
+#include "url/gurl.h"
+
+namespace content {
+
+namespace {
+
+using MojoType = media::interfaces::MediaPermission::Type;
+using NativeType = media::MediaPermission::Type;
+
+NativeType ConvertMediaPermissionType(MojoType type) {

[xhwang, 2016/03/30 07:11:34]

rockot: What's the new recommendation on consolidating native and mojo enums? I
kinda hate conversion or static_assert. Always using the mojom one is one
solution. But at least at this moment, our core media code knows nothing about
mojo.

+  switch (type) {
+    case MojoType::PROTECTED_MEDIA_IDENTIFIER:
+      return NativeType::PROTECTED_MEDIA_IDENTIFIER;
+    case MojoType::AUDIO_CAPTURE:
+      return NativeType::AUDIO_CAPTURE;
+    case MojoType::VIDEO_CAPTURE:
+      return NativeType::VIDEO_CAPTURE;
+  }
+  NOTREACHED();
+  return NativeType::PROTECTED_MEDIA_IDENTIFIER;
+}
+
+}  // namespace
+
+// static
+void MediaPermissionImpl::Create(
+    PermissionServiceContext* permission_service_context,
+    media::interfaces::MediaPermissionRequest request) {
+  // The created object is strongly bound to (and owned by) the pipe.
+  new MediaPermissionImpl(permission_service_context, std::move(request));
+}
+
+MediaPermissionImpl::MediaPermissionImpl(
+    PermissionServiceContext* permission_service_context,
+    media::interfaces::MediaPermissionRequest request)
+    : permission_service_context_(permission_service_context),
+      binding_(this, std::move(request)),
+      weak_factory_(this) {
+  DVLOG(1) << __FUNCTION__;
+}
+
+MediaPermissionImpl::~MediaPermissionImpl() {
+  DVLOG(1) << __FUNCTION__;
+}
+
+void MediaPermissionImpl::HasPermission(MediaPermission::Type type,
+                                        const mojo::String& security_origin,
+                                        const HasPermissionCallback& callback) {
+  DVLOG(3) << __FUNCTION__;
+  GetMediaPermission()->HasPermission(
+      ConvertMediaPermissionType(type), GURL(security_origin.get()),
+      base::Bind(&MediaPermissionImpl::OnPermissionStatus,
+                 weak_factory_.GetWeakPtr(), callback));
+}
+
+void MediaPermissionImpl::RequestPermission(
+    MediaPermission::Type type,
+    const mojo::String& security_origin,
+    const RequestPermissionCallback& callback) {
+  DVLOG(3) << __FUNCTION__;
+  GetMediaPermission()->RequestPermission(
+      ConvertMediaPermissionType(type), GURL(security_origin.get()),
+      base::Bind(&MediaPermissionImpl::OnPermissionStatus,
+                 weak_factory_.GetWeakPtr(), callback));
+}
+
+void MediaPermissionImpl::GetMediaPermissionService(
+    mojom::PermissionServiceRequest request) {
+  permission_service_context_->CreateService(std::move(request));
+}
+
+media::MediaPermission* MediaPermissionImpl::GetMediaPermission() {
+  if (!media_permission_) {
+    media_permission_.reset(new MediaPermissionDispatcher(
+        base::Bind(&MediaPermissionImpl::GetMediaPermissionService,
+                   weak_factory_.GetWeakPtr())));
+  }
+  return media_permission_.get();
+}
+
+void MediaPermissionImpl::OnPermissionStatus(
+    const mojo::Callback<void(bool)>& callback,
+    bool success) {
+  DVLOG(3) << __FUNCTION__ << ": " << success;
+  callback.Run(success);
+}
+
+}  // namespace content