opengles emulator: dynamicaly grow ReadBuffer

In case we're receiving packets larger then the initial size
of the read buffer, we dynamicaly grow (X2 steps) the size of
the buffer. An example for this large buffer is a 4MB texture
in JetCarStunts.

Change-Id: I167caddb731583811c009321d4f8fb2f7eea032c
1 file changed