Add chrome.hid.getUserSelectedDevices API.

extensions/browser/api/hid/hid_api.h

Index: extensions/browser/api/hid/hid_api.h
diff --git a/extensions/browser/api/hid/hid_api.h b/extensions/browser/api/hid/hid_api.h
index afa1cfa12386093c1ab10763e29877f04e4a9f09..85e3c386b4822fe04931091bae004d4cd50204ed 100644
--- a/extensions/browser/api/hid/hid_api.h
+++ b/extensions/browser/api/hid/hid_api.h
@@ -17,6 +17,7 @@
 
 namespace device {
 class HidConnection;
+class HidDeviceInfo;
 class HidService;
 }  // namespace device
 
@@ -26,6 +27,8 @@ class IOBuffer;
 
 namespace extensions {
 
+class DevicePermissionsPrompt;
+
 class HidGetDevicesFunction : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("hid.getDevices", HID_GETDEVICES);
@@ -43,6 +46,27 @@ class HidGetDevicesFunction : public UIThreadExtensionFunction {
   DISALLOW_COPY_AND_ASSIGN(HidGetDevicesFunction);
 };
 
+class HidGetUserSelectedDevicesFunction : public UIThreadExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("hid.getUserSelectedDevices",
+                             HID_GETUSERSELECTEDDEVICES)
+
+  HidGetUserSelectedDevicesFunction();
+
+ private:
+  ~HidGetUserSelectedDevicesFunction() override;
+
+  // ExtensionFunction:
+  ResponseAction Run() override;
+
+  void OnDevicesChosen(
+      const std::vector<scoped_refptr<device::HidDeviceInfo>>& devices);
+
+  scoped_ptr<DevicePermissionsPrompt> prompt_;
+
+  DISALLOW_COPY_AND_ASSIGN(HidGetUserSelectedDevicesFunction);
+};
+
 class HidConnectFunction : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("hid.connect", HID_CONNECT);