GitLab

Putting chrometrace.log in the current working directory is not
useful on Android. Generate a filepath on the sdcard instead the
same way we do it for intent triggered tracing.

R=piman@chromium.org, wangxianzhu@chromium.org

Review URL: https://codereview.chromium.org/232053002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263153 0039d316-1c4b-4281-b951-d872f2087c98