Seems to be a common problem with pnacl apps (but not all). 
For example, clicking and dragging the animated surface on this demo (and some of the other demos) while in tablet mode will also bring up the keyboard: https://gonativeclient.appspot.com/demo/life

Reported by user in Chromebook Central. Verified by TC.

https://productforums.google.com/forum/#!topic/chromebook-central/JG8nubARbIk

#CBC-RS/TC-watchlist

(Bulk Edit) Adding the new conops Chrome OS hotlist to all open issues with the "#CBC-RS/TC-watchlist" tag, our former tracking tag.

 Issue 812651  has been merged into this issue.

+kochi@

By default Nacl (or PPAPI) plugins have text input type = text.
If they don't want that, the plugin needs to set it to none explicitly.

(For instance, the code below shows how Chromoting is doing so:
https://chromium.googlesource.com/chromium/src/+/b33a9282728898428632c036f2c09e258bfcd888/remoting/client/plugin/chromoting_instance.cc#186)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The design decision for the default state was made to support text (IME) inputs on any "IME-oblivious" plugins.

7 years ago, having type=text was not that annoying (except for a case on MacOS:  Bug 102808 ), but yeah,
in the modern era of detachable/convertible/tablet devices with virtual keyboards, we might want to reconsider...
(Besides, major clients (i.e., PPAPI Flash and PDF plugin) now are fully IME-aware now anyway.)

Thank you very much for the valuable info! Could you please also update http://b/74207142 so that the Google Earth team knows about this? I believe they're going to look into the bug soon.

Marking as ExternalDependency as it seems to be fixable from the plugin side.