Move MSE parsers under "formats" root directory.

Changes made programatically:
find -name \*.cc -o -name \*.h | xargs sed -r -i 's,media/(mp2t|mp3|mp4|webm)/,media/formats/\1/,g'
find -name \*.cc -o -name \*.h | xargs sed -r -i 's,MEDIA_(MP2T|MP3|MP4|WEBM)_,MEDIA_FORMATS_\1_,g'
find -name \*.gyp | xargs sed -r -i "s,'(mp2t|mp3|mp4|webm)/,'formats/\1/,g"

BUG=none
TEST=compiles

Review URL: https://codereview.chromium.org/136053003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246512 0039d316-1c4b-4281-b951-d872f2087c98
Telemetry: Fix precision problem in slice ends.

The epsilon being used was too small for the large
microsecond values in some traces. This rounds back to the
source precision which should be robust (up to double
precision limits for storing micros-as-millis).

BUG=335833

Review URL: https://codereview.chromium.org/144743002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246513 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246513