First batch of GCC fixes for GPU code.

gpu/command_buffer/service/command_buffer_service.cc

Index: gpu/command_buffer/service/command_buffer_service.cc
diff --git a/gpu/command_buffer/service/command_buffer_service.cc b/gpu/command_buffer/service/command_buffer_service.cc
index 1ab2a9b532e3ae568bedacf20c2c92ce37a8fe9f..2916bf8100dc485e3e34847d9995904a40df2bc3 100644
--- a/gpu/command_buffer/service/command_buffer_service.cc
+++ b/gpu/command_buffer/service/command_buffer_service.cc
@@ -82,10 +82,10 @@ int32 CommandBufferService::CreateTransferBuffer(size_t size) {
 
   if (unused_registered_object_elements_.empty()) {
     // Check we haven't exceeded the range that fits in a 32-bit integer.
-    int32 handle = static_cast<int32>(registered_objects_.size());
-    if (handle != registered_objects_.size())
+    if (registered_objects_.size() > std::numeric_limits<uint32>::max())
       return -1;
 
+    int32 handle = static_cast<int32>(registered_objects_.size());
     registered_objects_.push_back(buffer);
     return handle;
   }