Add streaming method profiling support.

The goal is to allow DDMS to start/stop method profiling in apps that
don't have permission to write to /sdcard.  Instead of writing the
profiling data to disk and then pulling it off, we just blast the whole
thing straight from memory.

This includes:

 - New method tracing start call (startMethodTracingDdms).
 - Rearrangement of existing VMDebug method tracing calls for sanity.
 - Addition of "vector" chunk send function, with corresponding
   update to the JDWP transport function.
 - Reshuffled the method trace start interlock, which seemed racy.
 - Post new method-trace-profiling-streaming feature to DDMS.

Also:

 - Added an internal exception-throw function that allows a printf
   format string, so we can put useful detail into exception messages.

For bug 2160407.

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