Specify bitmaptools dependency as a host dependency

This is a fix for 'gclient hooks' regression that was introduced by
r256155:

" Added bitmaptools dependency to telemetry_gpu_test_run target.
  Review URL: https://codereview.chromium.org/189663008 "

BUG=350602
TEST= build Linux version of Chromium for MIPS/ARM

Review URL: https://codereview.chromium.org/194813004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256405 0039d316-1c4b-4281-b951-d872f2087c98
Update V8 to version 3.25.7.2.

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/194933005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256406 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256407 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256407