0a365da71501c6a98c58585bea791eba7396cb58
(This is a merge of http://go/wvgerrit/70303) The new platform.cpp file was not added to every build file that needs to reference it. This was not detected as all of these platforms are non-Windows, and platform.cpp is only required on Windows builds right now. To avoid future problems should it ever provide non-Windows functionality, though, I am adding it to the build files now. Bug: 122953649 Test: Android Build Change-Id: I57b983ad078dfef198b7c3e97fb93336b09704b6
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