Add support to GrGLInterface for vertex array objects

gyp/gpu.gypi

 # Include this gypi to include all 'gr' and 'skgr' 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
 #
 {
   'variables': {
     'gr_sources': [
@@ skipping 196 matching lines @@
       '<(skia_src_path)/gpu/gl/debug/GrTextureUnitObj.h',
       '<(skia_src_path)/gpu/gl/debug/GrTextureUnitObj.cpp',
       '<(skia_src_path)/gpu/gl/debug/GrFrameBufferObj.h',
       '<(skia_src_path)/gpu/gl/debug/GrFrameBufferObj.cpp',
       '<(skia_src_path)/gpu/gl/debug/GrShaderObj.h',
       '<(skia_src_path)/gpu/gl/debug/GrShaderObj.cpp',
       '<(skia_src_path)/gpu/gl/debug/GrProgramObj.h',
       '<(skia_src_path)/gpu/gl/debug/GrProgramObj.cpp',
       '<(skia_src_path)/gpu/gl/debug/GrDebugGL.h',
       '<(skia_src_path)/gpu/gl/debug/GrDebugGL.cpp',
+      '<(skia_src_path)/gpu/gl/debug/GrVetexArrayObj.h',
     ],
     'gr_null_gl_sources': [
       '<(skia_src_path)/gpu/gl/GrGLCreateNullInterface.cpp',
     ],
 
     'skgr_sources': [
       '<(skia_include_path)/gpu/SkGpuDevice.h',
       '<(skia_include_path)/gpu/SkGr.h',
       '<(skia_include_path)/gpu/SkGrPixelRef.h',
       '<(skia_include_path)/gpu/SkGrTexturePixelRef.h',
@@ skipping 37 matching lines @@
       '<(skia_src_path)/gpu/gl/SkNullGLContext.cpp',
     ],
   },
 }
 
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