HID : read-only device access fallback when read/write fails

device/hid/hid_connection_linux.cc

Index: device/hid/hid_connection_linux.cc
diff --git a/device/hid/hid_connection_linux.cc b/device/hid/hid_connection_linux.cc
index 936c7b1bd23fe95a13c2fd29453fe2119ab59089..204d41d47554ee0ea9cadc1eefe470aa334a5d4f 100644
--- a/device/hid/hid_connection_linux.cc
+++ b/device/hid/hid_connection_linux.cc
@@ -64,8 +64,20 @@ HidConnectionLinux::HidConnectionLinux(HidDeviceInfo device_info,
 
   base::File device_file(base::FilePath(dev_node), flags);
   if (!device_file.IsValid()) {
-    LOG(ERROR) << device_file.error_details();
-    return;
+    base::File::Error file_error = device_file.error_details();
+
+    if (file_error == base::File::FILE_ERROR_ACCESS_DENIED) {
+      flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
+
+      base::File device_file(base::FilePath(dev_node), flags);
+      if (!device_file.IsValid()) {
+        LOG(ERROR) << device_file.error_details();
+        return;
+      }
+    } else {
+      LOG(ERROR) << file_error;
+      return;
+    }
   }
   if (fcntl(device_file.GetPlatformFile(), F_SETFL,
             fcntl(device_file.GetPlatformFile(), F_GETFL) | O_NONBLOCK)) {