Use common display initialization logic for Unix

gyp/gpu.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # Include this gypi to include all 'gpu' files
 # The parent gyp/gypi file must define
 #       'skia_src_path'     e.g. skia/trunk/src
 #       'skia_include_path' e.g. skia/trunk/include
 #
 # The skia build defines these in common_variables.gypi
@@ skipping 383 matching lines @@
       '<(skia_src_path)/gpu/gl/egl/GrGLCreateNativeInterface_egl.cpp',
       '<(skia_src_path)/gpu/gl/iOS/GrGLCreateNativeInterface_iOS.cpp',
       '<(skia_src_path)/gpu/gl/android/GrGLCreateNativeInterface_android.cpp',
 
       # Sk files
       '<(skia_src_path)/gpu/gl/mac/SkCreatePlatformGLContext_mac.cpp',
       '<(skia_src_path)/gpu/gl/win/SkCreatePlatformGLContext_win.cpp',
       '<(skia_src_path)/gpu/gl/glx/SkCreatePlatformGLContext_glx.cpp',
       '<(skia_src_path)/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp',
       '<(skia_src_path)/gpu/gl/iOS/SkCreatePlatformGLContext_iOS.mm',
+
+      # OS helper files
+      '<(skia_src_path)/gpu/gl/glx/GrNativeDisplay_glx.cpp',
+      '<(skia_src_path)/gpu/gl/glx/GrNativeDisplay_glx.h',
     ],
     'skgpu_mesa_gl_sources': [
       '<(skia_src_path)/gpu/gl/mesa/GrGLCreateMesaInterface.cpp',
 
       # Sk files
       '<(skia_src_path)/gpu/gl/mesa/SkMesaGLContext.cpp',
       '<(skia_src_path)/gpu/gl/mesa/SkMesaGLContext.h',
     ],
     'skgpu_angle_gl_sources': [
       '<(skia_src_path)/gpu/gl/angle/GrGLCreateANGLEInterface.cpp',
@@ skipping 32 matching lines @@
       '<(skia_src_path)/gpu/gl/debug/SkDebugGLContext.cpp',
       '<(skia_src_path)/gpu/gl/debug/SkDebugGLContext.h',
     ],
     'skgpu_null_gl_sources': [
       '<(skia_src_path)/gpu/gl/GrGLCreateNullInterface.cpp',
       '<(skia_src_path)/gpu/gl/SkNullGLContext.cpp',
       '<(skia_include_path)/gpu/gl/SkNullGLContext.h',
     ],
   },
 }