Use calloc to allocate data that will be uploaded to vertex/index buffers in Chrome

include/gpu/GrCaps.h

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef GrCaps_DEFINED
 #define GrCaps_DEFINED
 
@@ skipping 200 matching lines @@
         SkASSERT(fGeometryBufferMapThreshold >= 0);
         return fGeometryBufferMapThreshold;
     }
 
     bool supportsInstancedDraws() const {
         return fSupportsInstancedDraws;
     }
 
     bool fullClearIsFree() const { return fFullClearIsFree; }
 
+    /** True in environments that will issue errors if memory uploaded to buffers 
+        is not initialized (even if not read by draw calls). */
+    bool mustClearUploadedBufferData() const { return fMustClearUploadedBufferData; }
+
 protected:
     /** Subclasses must call this at the end of their constructors in order to apply caps
         overrides requested by the client. Note that overrides will only reduce the caps never
         expand them. */
     void applyOptionsOverrides(const GrContextOptions& options);
 
     SkAutoTUnref<GrShaderCaps>    fShaderCaps;
 
     bool fNPOTTextureTileSupport                     : 1;
     bool fMipMapSupport                              : 1;
     bool fTwoSidedStencilSupport                     : 1;
     bool fStencilWrapOpsSupport                      : 1;
     bool fDiscardRenderTargetSupport                 : 1;
     bool fReuseScratchTextures                       : 1;
     bool fReuseScratchBuffers                        : 1;
     bool fGpuTracingSupport                          : 1;
     bool fCompressedTexSubImageSupport               : 1;
     bool fOversizedStencilSupport                    : 1;
     bool fTextureBarrierSupport                      : 1;
     bool fSupportsInstancedDraws                     : 1;
     bool fFullClearIsFree                            : 1;
+    bool fMustClearUploadedBufferData                : 1;
 
     // Driver workaround
     bool fUseDrawInsteadOfClear                      : 1;
     bool fUseDrawInsteadOfPartialRenderTargetWrite   : 1;
 
     BlendEquationSupport fBlendEquationSupport;
     uint32_t fAdvBlendEqBlacklist;
     GR_STATIC_ASSERT(kLast_GrBlendEquation < 32);
 
     uint32_t fMapBufferFlags;
     int fGeometryBufferMapThreshold;
 
     int fMaxRenderTargetSize;
     int fMaxTextureSize;
     int fMinTextureSize;
     int fMaxSampleCount;
 
     // The first entry for each config is without msaa and the second is with.
     bool fConfigRenderSupport[kGrPixelConfigCnt][2];
     bool fConfigTextureSupport[kGrPixelConfigCnt];
 
 private:
     bool fSupressPrints : 1;
     bool fDrawPathMasksToCompressedTextureSupport : 1;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif