This works around a race condition observed with GENERATED_SOURCES. A
global solution might be to make GENERATED_SOURCES part of the
'export' tier; this is a smaller fix.
--HG--
rename : widget/android/bindings/mediacodec-classes.txt => widget/android/bindings/MediaCodec-classes.txt
rename : widget/android/bindings/surfacetexture-classes.txt => widget/android/bindings/SurfaceTexture-classes.txt
extra : rebase_source : 073dadd8c1b48ea32f975b2232c2bdeafe315ab4