Move GrContext::makeDrawContext to new GrContextPriv object

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 70 matching lines @@
       '<(skia_src_path)/gpu/GrBlurUtils.h',
       '<(skia_src_path)/gpu/GrBuffer.cpp',
       '<(skia_src_path)/gpu/GrBufferAllocPool.cpp',
       '<(skia_src_path)/gpu/GrBufferAllocPool.h',
       '<(skia_src_path)/gpu/GrCaps.cpp',
       '<(skia_src_path)/gpu/GrClip.cpp',
       '<(skia_src_path)/gpu/GrClipMaskManager.h',
       '<(skia_src_path)/gpu/GrClipMaskManager.cpp',
       '<(skia_src_path)/gpu/GrColorSpaceXform.cpp',
       '<(skia_src_path)/gpu/GrContext.cpp',
+      '<(skia_src_path)/gpu/GrContextPriv.h',
       '<(skia_src_path)/gpu/GrCoordTransform.cpp',
       '<(skia_src_path)/gpu/GrDefaultGeoProcFactory.cpp',
       '<(skia_src_path)/gpu/GrDefaultGeoProcFactory.h',
       '<(skia_src_path)/gpu/GrDrawContext.cpp',
       '<(skia_src_path)/gpu/GrDrawContextPriv.h',
       '<(skia_src_path)/gpu/GrPathRenderingDrawContext.cpp',
       '<(skia_src_path)/gpu/GrPathRenderingDrawContext.h',
       '<(skia_src_path)/gpu/GrDrawingManager.cpp',
       '<(skia_src_path)/gpu/GrDrawingManager.h',
       '<(skia_src_path)/gpu/GrDrawTarget.cpp',
@@ skipping 419 matching lines @@
       '<(skia_src_path)/gpu/gl/win/GrGLCreateNativeInterface_win.cpp',
       '<(skia_src_path)/gpu/gl/glx/GrGLCreateNativeInterface_glx.cpp',
       '<(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',
     ],
     'skgpu_null_gl_sources': [
     ],
   },
 }