Adding third party library hidapi

third_party/hidapi/README.chromium

Index: third_party/hidapi/README.chromium
diff --git a/third_party/hidapi/README.chromium b/third_party/hidapi/README.chromium
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+Name: hidapi
+URL: http://www.signal11.us/oss/hidapi/
+Version: 0.8.0-rc1
+License: BSD
+License File: LICENSE-bsd.txt
+Security Critical: yes
+
+Description:
+HIDAPI is a multi-platform library which allows an application to interface with
+USB and Bluetooth HID-Class devices on Windows, Linux, and Mac OS X. While it
+can be used to communicate with standard HID devices like keyboards, mice, and
+Joysticks, it is most useful when used with custom (Vendor-Defined) HID devices.
+
+Local Modifications:
+
+1. Only needed files are included:
+  - src/hidapi.h
+  - src/linux/hid.c -> hidapi_linux.c
+  - src/mac/hid.c -> hidapi_mac.c
+  - src/windows/hid.c -> hidapi_win.c
+  - src/LICENSE
+  - src/AUTHORS.txt
+  - src/README.txt
+
+2. Applied patch hidapi_linux.c.patch
+3. Fixed license header (pending change to the upstream).