Remove unit_tests from chrome_official_builder

OOMing.

TBR=dxie@chromium.org
BUG=330432

Review URL: https://codereview.chromium.org/130503012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245687 0039d316-1c4b-4281-b951-d872f2087c98
Add infinite_scrolling test case to Silk benchmark

This CL adds an infinite scrolling benchmark to the Silk page set.

Review URL: https://codereview.chromium.org/141563006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245688 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245688
Replace use of base::RandXXX() with rand() to improve runtime of SeekableBufferTest.

r244419 replaced rand() with base::RandXXX(), but this has caused Windows Dr. Memory runs to take 100X longer to run.  Since the test doesn't need good random numbers, this change reverts back to using the rand() in <cstdlib>.

TEST=Confirmed media_unittests performance is now on-par with that prior to r244419.

Review URL: https://codereview.chromium.org/139303022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245690 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245690