Only initialize a std::string with data when the data has len > 0.

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder_passthrough.h"
 
 #include "base/strings/string_number_conversions.h"
 
 namespace gpu {
 namespace gles2 {
@@ skipping 1071 matching lines @@
 error::Error GLES2DecoderPassthroughImpl::DoGetProgramInfoLog(
     GLuint program,
     std::string* infolog) {
   GLint info_log_len = 0;
   glGetProgramiv(GetProgramServiceID(program, resources_), GL_INFO_LOG_LENGTH,
                  &info_log_len);
 
   std::vector<char> buffer(info_log_len, 0);
   glGetProgramInfoLog(GetProgramServiceID(program, resources_), info_log_len,
                       nullptr, buffer.data());
-  *infolog = std::string(buffer.data());
+  *infolog = info_log_len > 0 ? std::string(buffer.data()) : std::string();
   return error::kNoError;
 }
 
 error::Error GLES2DecoderPassthroughImpl::DoGetRenderbufferParameteriv(
     GLenum target,
     GLenum pname,
     GLsizei bufsize,
     GLsizei* length,
     GLint* params) {
   glGetRenderbufferParameterivRobustANGLE(target, pname, bufsize, length,
@@ skipping 33 matching lines @@
 }
 
 error::Error GLES2DecoderPassthroughImpl::DoGetShaderInfoLog(
     GLuint shader,
     std::string* infolog) {
   GLuint service_id = GetShaderServiceID(shader, resources_);
   GLint info_log_len = 0;
   glGetShaderiv(service_id, GL_INFO_LOG_LENGTH, &info_log_len);
   std::vector<char> buffer(info_log_len, 0);
   glGetShaderInfoLog(service_id, info_log_len, nullptr, buffer.data());
-  *infolog = std::string(buffer.data());
+  *infolog = info_log_len > 0 ? std::string(buffer.data()) : std::string();
   return error::kNoError;
 }
 
 error::Error GLES2DecoderPassthroughImpl::DoGetShaderPrecisionFormat(
     GLenum shadertype,
     GLenum precisiontype,
     GLint* range,
     GLint* precision,
     int32_t* success) {
   FlushErrors();
@@ skipping 2165 matching lines @@
     GLuint texture,
     GLboolean promotion_hint,
     GLint display_x,
     GLint display_y) {
   NOTIMPLEMENTED();
   return error::kNoError;
 }
 
 }  // namespace gles2
 }  // namespace gpu