Add direct getter for GrCaps to GrContext.

tests/GrPorterDuffTest.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 "SkXfermode.h"
 #include "Test.h"
 
@@ skipping 931 matching lines @@
     GrContextOptions opts;
     opts.fSuppressDualSourceBlending = true;
     GrContextFactory factory(opts);
     factory.get(GrContextFactory::kNull_GLContextType);
     GrContext* ctx = factory.get(GrContextFactory::kNull_GLContextType);
     if (!ctx) {
         SkFAIL("Failed to create null context without ARB_blend_func_extended.");
         return;
     }
 
-    const GrCaps& caps = *ctx->getGpu()->caps();
+    const GrCaps& caps = *ctx->caps();
     if (caps.shaderCaps()->dualSourceBlendingSupport()) {
         SkFAIL("Null context failed to honor request for no ARB_blend_func_extended.");
         return;
     }
 
     GrBackendTextureDesc fakeDesc;
     fakeDesc.fConfig = kRGBA_8888_GrPixelConfig;
     fakeDesc.fWidth = fakeDesc.fHeight = 100;
     fakeDesc.fTextureHandle = 1;
     SkAutoTUnref<GrTexture> fakeTexture(ctx->resourceProvider()->wrapBackendTexture(fakeDesc));
@@ skipping 39 matching lines @@
                 TEST_ASSERT(!xp->hasSecondaryOutput());
                 xp->getOptimizations(colorPOI, covPOI, false, 0, caps);
                 TEST_ASSERT(!xp->hasSecondaryOutput());
             }
         }
     }
 }
 
 #endif