Add new 4K, 24fps media files for perf-tests. Update page-set to start using new files.

Adding sha1 files for new 4K media files for Telemetry perf-tests.

Verified by manually downloading files from GCS, using sha1 files as input, and playing back the files.

BUG=336506

Review URL: https://codereview.chromium.org/141893003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246291 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246291
[Pepper] Add append mode write support to PepperFileSystemBrowserHost

 * Replace |max_written_offset|s with FileGrowth. 

BUG=334171

Review URL: https://codereview.chromium.org/143133002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246292 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246292