Add Gr*Proxy classes

tests/ClearTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 
 #if SK_SUPPORT_GPU
@@ skipping 27 matching lines @@
 }
 
 static bool reset_dc(sk_sp<GrDrawContext>* dc, GrContext* context, int w, int h) {
     SkDEBUGCODE(uint32_t oldID = 0;)
     if (*dc) {
         SkDEBUGCODE(oldID = (*dc)->accessRenderTarget()->getUniqueID();)
         dc->reset(nullptr);
     }
     context->freeGpuResources();
 
-    *dc = context->newDrawContext(GrContext::kTight_BackingFit, w, h, kRGBA_8888_GrPixelConfig);
+    *dc = context->newDrawContext(SkBackingFit::kExact, w, h, kRGBA_8888_GrPixelConfig);
 
     SkASSERT((*dc)->accessRenderTarget()->getUniqueID() != oldID);
 
     return *dc != nullptr;
 }
 
 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ClearBatch, reporter, ctxInfo) {
     GrContext* context = ctxInfo.fGrContext;
     static const int kW = 10;
     static const int kH = 10;
@@ skipping 155 matching lines @@
     }
     if (!check_rect(drawContext.get(), outerLeftEdge, kColor1, &actualValue, &failX, &failY) ||
         !check_rect(drawContext.get(), outerTopEdge, kColor1, &actualValue, &failX, &failY) ||
         !check_rect(drawContext.get(), outerRightEdge, kColor1, &actualValue, &failX, &failY) ||
         !check_rect(drawContext.get(), outerBottomEdge, kColor1, &actualValue, &failX, &failY)) {
         ERRORF(reporter, "Expected 0x%08x but got 0x%08x at (%d, %d).", kColor1, actualValue,
                failX, failY);
     }
 }
 #endif