First batch of GCC fixes for GPU code.

gpu/command_buffer/service/cmd_parser.cc

Index: gpu/command_buffer/service/cmd_parser.cc
diff --git a/gpu/command_buffer/service/cmd_parser.cc b/gpu/command_buffer/service/cmd_parser.cc
index 019e7b2229ea9eb15d506bd37a510c1279a9e5a1..13417320c447fe42aa4505f33b5a05a281cf306a 100644
--- a/gpu/command_buffer/service/cmd_parser.cc
+++ b/gpu/command_buffer/service/cmd_parser.cc
@@ -74,7 +74,7 @@ parse_error::ParseError CommandParser::ProcessCommand() {
     return parse_error::kParseInvalidSize;
   }
 
-  if (header.size + get > entry_count_) {
+  if (static_cast<size_t>(header.size + get) > entry_count_) {
     DLOG(INFO) << "Error: get offset out of bounds";
     return parse_error::kParseOutOfBounds;
   }