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The platform independent C++ code for TraceEvent has always been in base.
This CL moves the Android specific code into base to match.

This CL is needed now since trace is used by the Android library loader,
which is moving out of content.

Review URL: https://codereview.chromium.org/131553003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244153 0039d316-1c4b-4281-b951-d872f2087c98