Init allocated SkBitmap pixels
Init allocated SkBitmap pixels

Init allocated pixels to ARGB(0,0,0,0) in CreateSkBitmapFromHICON per
issue 30584.

BUG=30584
TEST=wine-valgrind should no longer complain as in issue 30584.

Review URL: http://codereview.chromium.org/504035

git-svn-id: http://src.chromium.org/svn/trunk/src@34852 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 338300601bc81d5a5e1deba953938f2d85ec9739
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser