Use D3D11 backend for ANGLE when available.

include/gpu/gl/angle/SkANGLEGLContext.h

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkANGLEGLContext_DEFINED
 #define SkANGLEGLContext_DEFINED
 
@@ skipping 15 matching lines @@
             return NULL;
         }
         SkANGLEGLContext* ctx = SkNEW(SkANGLEGLContext);
         if (!ctx->isValid()) {
             SkDELETE(ctx);
             return NULL;
         }
         return ctx;
     }
 
+    static EGLDisplay GetD3DEGLDisplay(EGLNativeDisplayType nativeDisplay);
+
 private:
     SkANGLEGLContext();
     void destroyGLContext();
 
     EGLContext fContext;
     EGLDisplay fDisplay;
     EGLSurface fSurface;
 };
 
 #endif
 
 #endif