skia: add ability to load command_buffer_gles2

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 416 matching lines @@
       '<(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',
 
       # Sk files
       '<(skia_include_path)/gpu/gl/angle/SkANGLEGLContext.h',
       '<(skia_src_path)/gpu/gl/angle/SkANGLEGLContext.cpp',
     ],
+    'skgpu_command_buffer_gl_sources': [
+      # Sk files
+      '<(skia_include_path)/gpu/gl/command_buffer/SkCommandBufferGLContext.h',
+      '<(skia_src_path)/gpu/gl/command_buffer/SkCommandBufferGLContext.cpp',
+    ],
     'skgpu_debug_gl_sources': [
       '<(skia_src_path)/gpu/gl/debug/GrGLCreateDebugInterface.cpp',
       '<(skia_src_path)/gpu/gl/debug/GrFakeRefObj.h',
       '<(skia_src_path)/gpu/gl/debug/GrBufferObj.h',
       '<(skia_src_path)/gpu/gl/debug/GrBufferObj.cpp',
       '<(skia_src_path)/gpu/gl/debug/GrFBBindableObj.h',
       '<(skia_src_path)/gpu/gl/debug/GrRenderBufferObj.h',
       '<(skia_src_path)/gpu/gl/debug/GrTextureObj.h',
       '<(skia_src_path)/gpu/gl/debug/GrTextureObj.cpp',
       '<(skia_src_path)/gpu/gl/debug/GrTextureUnitObj.h',
@@ skipping 12 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',
     ],
   },
 }