Add a command to lose the context

third_party/khronos/README.chromium

 Name: Khronos header files
 Short Name: khronos_headers
 URL: http://www.khronos.org/registry
 Version: unknown
 Date: 2012-02-01
 License: MIT/X11, SGI Free Software License B
 Security Critical: no
 
 Description:
 This package contains header files for the EGL and OpenGL ES 2.0 APIs from
 Khronos. They are used for compiling code against these APIs as well as for
 generating the GL binding initialization logic.
 
 MIT/X11 (BSD like) license is for {EGL,KHR}/*, SGI Free Software License B is
 for GLES2/*.
 
 Local Modifications:
 
 GLES2/gl2.h
  - Added GL_CONTEXT_LOST constant.
  - Added include of gl2chromium.h
 GLES2/gl2ext.h
  - Added Chromium and Angle extensions.
- - Added ANGLE_instanced_arrays
+ - Added GL_ANGLE_instanced_arrays
  - Added GL_ARB_robustness (subsetted)
  - Added GL_ARB_texture_rectangle (subsetted)
- - Added GL_EXT_framebuffer_multisample
+ - Added GL_CHROMIUM_async_pixel_transfers
+ - Added GL_CHROMIUM_bind_uniform_location
+ - Added GL_CHROMIUM_command_buffer_latency_query
  - Added GL_CHROMIUM_command_buffer_query
- - Added GL_CHROMIUM_command_buffer_latency_query
  - Added GL_CHROMIUM_copy_texture
- - Added GL_CHROMIUM_bind_uniform_location
  - Added GL_CHROMIUM_get_error_query
  - Added GL_CHROMIUM_iosurface
+ - Added GL_CHROMIUM_lose_context
+ - Added GL_CHROMIUM_pixel_transfer_buffer_object
  - Added GL_CHROMIUM_texture_from_image
- - Added GL_CHROMIUM_pixel_transfer_buffer_object
- - Added GL_CHROMIUM_async_pixel_transfers
+ - Added GL_EXT_framebuffer_multisample
  - Added GL_NVX_gpu_memory_info
  - Added include of gl2chromium.h
 GLES2/glchromium.h
  - Added This file defines macros to change glXXX to GLES2XXX
    since Chromium includes the system GL there are conflicts
    otherwise.
 EGL/eglplatform.h
  - Added EGLNative*Type for Mac.
 DEPS
  - Added DEPS file to prevent inclusion of external dependencies.