EngineRenderWidgetFeature::SetTextFromIME() actually explicitly clears the
text out of the target before inserting whatever text it was supplied by
the Client, though.  Could the Client actually be mistakenly
re-transmitting the same text, or not transmitting an IME-text update at
all, perhaps - should be obvious from the message logs whether either of
those is the case.

Looking at the logs, this is not a blimp bug. It might be an issue from the TextInputClient implementation.

client->GetTextRange and GetTextFromRange functions return old text which should have been updated in the previous insert/delete operations. 

The issue might somewhere in browser or renderer or blink . I will try to contact one of the owners for IME.

Obsolete, WontFix.