GitLab

Initial sets of fixes for themes to work well with HiDPI Windows. More changes coming in a separate CL.

oshima, Please review everything.
sky : For owners review.

1. Removed the PlatformScaleImage function from the ResourceBundle class and the corresponding
   code to scale images. With automatic scaling support in ImageSkia this is no longer needed.

2. The other change is in the NewTabButton class to use floating point scales everywhere instead
   of converting from scale factor to scale using different functions which causes problems.

BUG=362979
R=oshima,sky

Review URL: https://codereview.chromium.org/283383005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271075 0039d316-1c4b-4281-b951-d872f2087c98