New Java-based SamplingProfiler

Summary:
- libcore: new Java based SamplingProfiler
- dalvik: remove old SamplingProfiler native bits
- frameworks/base: New placeholder SamplingProfilerIntegration
- vendor/google: remove old profiler snapshot parsing code

Details:

libcore

   A new 100% Java SamplingProfiler. While it has more overhead that
   the old native one, the new one can actually collect more than the
   current PC and frame pointer, so you can get useful context of
   where your app is spending time. It currently provides ASCII hprof
   format output for use with tools like PerfAnal
	dalvik/src/main/java/dalvik/system/SamplingProfiler.java

    Unit test for the new SamplingProfiler
	dalvik/src/test/java/dalvik/system/SamplingProfilerTest.java

    Add core-tests-dalvik
	JavaLibrary.mk

dalvik

    Removing native code that supported the old SamplingProfiler
	vm/Dvm.mk
	vm/native/InternalNative.c
	vm/native/dalvik_system_SamplingProfiler.c

frameworks/base

  Placeholder SamplingProfilerIntegration. Later plans include
  generating EventStackTrace protobufs.

    New SamplingProfiler does not have a global instance, so
    SamplingProfilerIntegration provides one in INSTANCE. Old binary
    snapshot format is temporily replaced with ASCII hprof data.
	core/java/com/android/internal/os/SamplingProfilerIntegration.java

    Simplified interface for zygote profile snapshotting
	core/java/com/android/internal/os/ZygoteInit.java

    Current SamplingProfilerIntegration does not track event loop
    explicitly, but hprof information does include thread information.
	core/java/android/app/ActivityThread.java

vendor/google

    Removing code for parsing old SamplingProfiler snapshot format
	tools/samplingprofiler/Android.mk
	tools/samplingprofiler/NOTICE
	tools/samplingprofiler/profiler.iml
	tools/samplingprofiler/profiler.ipr
	tools/samplingprofiler/pull-snapshots.sh
	tools/samplingprofiler/sorttable.js
	tools/samplingprofiler/src/com/android/profiler/PrintHtml.java