NSTextInputClient calls are a huge source of sync calls from UIProcess to WebProcess, which is bad. Add support for handling them asynchronously.
Created attachment 227228 [details] proposed patch
Created attachment 227229 [details] updated to ToT
Attachment 227229 [details] did not pass style-queue: ERROR: Source/WebKit2/WebProcess/WebPage/WebPage.cpp:3980: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] Total errors found: 1 in 10 files If any of these errors are false positives, please file a bug against check-webkit-style.
Committed <http://trac.webkit.org/r165972>.