use SkImageInfo parameter for SkPixelRef constructor

BUG=

Review URL: https://codereview.chromium.org/102063005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240426 0039d316-1c4b-4281-b951-d872f2087c98
Update UseCounter values in histograms.xml.

Several have been added since without corresponding entries here.

http://src.chromium.org/viewvc/blink/trunk/Source/core/frame/UseCounter.h?r1=163544&r2=162617

BUG=

Review URL: https://codereview.chromium.org/103373005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240427 0039d316-1c4b-4281-b951-d872f2087c98
Move prefetch into its own directory.  This CL also separates the
field trial logic.  Prefetch field trials are no longer hard-coded.

BUG=327002

Review URL: https://codereview.chromium.org/111763002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240428 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240427
Replace wstring with string16 in sandbox

BUG=
R=cpu@chromium.org

Review URL: https://codereview.chromium.org/113173002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240429 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240429