Add PermissionDescriptor to the permissions Mojo interface.

third_party/WebKit/Source/modules/permissions/PermissionUtils.cpp

Index: third_party/WebKit/Source/modules/permissions/PermissionUtils.cpp
diff --git a/third_party/WebKit/Source/modules/permissions/PermissionUtils.cpp b/third_party/WebKit/Source/modules/permissions/PermissionUtils.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..ee29c2373f6ad53f5cbdce0ca331d81795539ce8
--- /dev/null
+++ b/third_party/WebKit/Source/modules/permissions/PermissionUtils.cpp
@@ -0,0 +1,52 @@
+// 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 "modules/permissions/PermissionUtils.h"
+
+#include "core/dom/Document.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/frame/LocalFrame.h"
+#include "public/platform/InterfaceProvider.h"
+#include "public/platform/Platform.h"
+
+namespace blink {
+
+using mojom::blink::PermissionDescriptor;
+using mojom::blink::PermissionDescriptorPtr;
+using mojom::blink::PermissionName;
+
+bool connectToPermissionService(
+    ExecutionContext* executionContext,
+    mojom::blink::PermissionServiceRequest request) {
+  InterfaceProvider* interfaceProvider = nullptr;
+  if (executionContext->isDocument()) {
+    Document* document = toDocument(executionContext);
+    if (document->frame())
+      interfaceProvider = document->frame()->interfaceProvider();
+  } else {
+    interfaceProvider = Platform::current()->interfaceProvider();
+  }
+
+  if (interfaceProvider)
+    interfaceProvider->getInterface(std::move(request));
+  return interfaceProvider;
+}
+
+PermissionDescriptorPtr createPermissionDescriptor(PermissionName name) {
+  auto descriptor = PermissionDescriptor::New();
+  descriptor->name = name;
+  return descriptor;
+}
+
+PermissionDescriptorPtr createMidiPermissionDescriptor(bool sysex) {
+  auto descriptor =
+      createPermissionDescriptor(mojom::blink::PermissionName::MIDI);
+  auto midiExtension = mojom::blink::MidiPermissionDescriptor::New();
+  midiExtension->sysex = sysex;
+  descriptor->extension = mojom::blink::PermissionDescriptorExtension::New();
+  descriptor->extension->set_midi(std::move(midiExtension));
+  return descriptor;
+}
+
+}  // namespace blink