Update vulkan format features in caps.

src/gpu/vk/GrVkGpu.cpp

 /*
  * 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 "GrVkGpu.h"
 
 #include "GrContextOptions.h"
@@ skipping 632 matching lines @@
 
 GrStencilAttachment* GrVkGpu::createStencilAttachmentForRenderTarget(const GrRenderTarget* rt,
                                                                      int width,
                                                                      int height) {
     SkASSERT(rt->asTexture());
     SkASSERT(width >= rt->width());
     SkASSERT(height >= rt->height());
 
     int samples = rt->numStencilSamples();
 
-    SkASSERT(this->vkCaps().stencilFormats().count());
-    const GrVkCaps::StencilFormat& sFmt = this->vkCaps().stencilFormats()[0];
+    const GrVkCaps::StencilFormat& sFmt = this->vkCaps().preferedStencilFormat();
 
     GrVkStencilAttachment* stencil(GrVkStencilAttachment::Create(this,
                                                                  GrGpuResource::kCached_LifeCycle,
                                                                  width,
                                                                  height,
                                                                  samples,
                                                                  sFmt));
     fStats.incStencilAttachmentCreates();
     return stencil;
 }
@@ skipping 769 matching lines @@
     aglSwapBuffers(aglGetCurrentContext());
     int set_a_break_pt_here = 9;
     aglSwapBuffers(aglGetCurrentContext());
 #elif defined(SK_BUILD_FOR_WIN32)
     SwapBuf();
     int set_a_break_pt_here = 9;
     SwapBuf();
 #endif
 #endif
 }