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

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 7e8455328295ce47ea52b5b9fad4f5c64f119c05..21d3d9374e297828f7fad0eda3d724056e79fd8b 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -471,6 +471,10 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
         fUseDrawInsteadOfPartialRenderTargetWrite = true;
     }
 
+    if (kChromium_GrGLDriver == ctxInfo.driver()) {
+        fMustClearUploadedBufferData = true;
+    }
+
     if (kGL_GrGLStandard == standard) {
         // ARB allows mixed size FBO attachments, EXT does not.
         if (ctxInfo.version() >= GR_GL_VER(3, 0) ||