Move some work from backend onClear to base class clear

src/gpu/GrTest.cpp

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTest.h"
 
@@ skipping 184 matching lines @@
 
     GrRenderTarget* onWrapBackendRenderTarget(const GrBackendRenderTargetDesc&,
                                               GrWrapOwnership) override {
         return NULL;
     }
 
     GrVertexBuffer* onCreateVertexBuffer(size_t size, bool dynamic) override { return NULL; }
 
     GrIndexBuffer* onCreateIndexBuffer(size_t size, bool dynamic) override { return NULL; }
 
-    void onClear(GrRenderTarget*, const SkIRect* rect, GrColor color,
-                         bool canIgnoreRect) override {}
+    void onClear(GrRenderTarget*, const SkIRect& rect, GrColor color) override {}
 
     void onClearStencilClip(GrRenderTarget*, const SkIRect& rect, bool insideClip) override {}
 
     void onDraw(const DrawArgs&, const GrNonInstancedVertices&) override {}
 
     bool onReadPixels(GrSurface* surface,
                       int left, int top, int width, int height,
                       GrPixelConfig,
                       void* buffer,
                       size_t rowBytes) override {
@@ skipping 46 matching lines @@
     SkASSERT(NULL == fGpu);
     fGpu = SkNEW_ARGS(MockGpu, (this, options));
     SkASSERT(fGpu);
     this->initCommon();
 
     // We delete these because we want to test the cache starting with zero resources. Also, none of
     // these objects are required for any of tests that use this context. TODO: make stop allocating
     // resources in the buffer pools.
     fDrawingMgr.abandon();
 }