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

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
index db92cb4dda07bee3497fdbda38c24f1fed4cc801..d9f2abc71a7f61dd723ccb0cc258274a8d3ee9fe 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
@@ -1089,7 +1089,7 @@ error::Error GLES2DecoderPassthroughImpl::DoGetProgramInfoLog(
   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;
 }
 
@@ -1143,7 +1143,7 @@ error::Error GLES2DecoderPassthroughImpl::DoGetShaderInfoLog(
   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;
 }