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

src/gpu/GrCaps.cpp

Index: src/gpu/GrCaps.cpp
diff --git a/src/gpu/GrCaps.cpp b/src/gpu/GrCaps.cpp
index 733c55bec4ec973caafb960a9d5d290d6a36a2ba..b7e43d6a114eb873df201c0a8bbf16f39cd10db2 100644
--- a/src/gpu/GrCaps.cpp
+++ b/src/gpu/GrCaps.cpp
@@ -93,6 +93,7 @@ GrCaps::GrCaps(const GrContextOptions& options) {
     fTextureBarrierSupport = false;
     fSupportsInstancedDraws = false;
     fFullClearIsFree = false;
+    fMustClearUploadedBufferData = false;
 
     fUseDrawInsteadOfClear = false;
 
@@ -156,6 +157,7 @@ SkString GrCaps::dump() const {
     r.appendf("Texture Barrier Support            : %s\n", gNY[fTextureBarrierSupport]);
     r.appendf("Supports instanced draws           : %s\n", gNY[fSupportsInstancedDraws]);
     r.appendf("Full screen clear is free          : %s\n", gNY[fFullClearIsFree]);
+    r.appendf("Must clear buffer memory           : %s\n", gNY[fMustClearUploadedBufferData]);
     r.appendf("Draw Instead of Clear [workaround] : %s\n", gNY[fUseDrawInsteadOfClear]);
     r.appendf("Draw Instead of TexSubImage [workaround] : %s\n",
               gNY[fUseDrawInsteadOfPartialRenderTargetWrite]);