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Add a streaming mode for tracing. Streaming uses a buffer of 16KB
and writes to the output when that buffer gets full. Streaming mode
can be enabled with -Xmethod-trace-stream and is currently not
exposed otherwise.

Add a python script that can parse the streaming format, which
simply contains strings for newly encountered threads and methods
inline, and create output that can be used with traceview.

Add Trace::Pause and Trace::Abort, which can pause and abort tracing.
Abort is different from Stop in that it does not write the data.

Add code to the zygote hooks JNI implementation that pauses tracing
before the fork, making sure that a child cannot clobber the parent's
data.

Add code to the zygote hooks JNI implementation that aborts old
tracing and starts new tracing in the child after the fork. Currently
base the output on the pid. This will not work on an unmodified
device, as the profiles directory is not generally writable, but
we do not have enough information at that po...