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On the Mac, we populate NSImage from bitmaps in resource bundles. Introduce ImageSkia which contains vector of SkBitmaps. Previously this functionality was within ImageRepSkia. ImageSkia exposes this.

Move gfx::Image::GetSkBitmapAtIndex and gfx::Image::GetNumSkBitmaps to ImageSkia

BUG=122992
TEST=None

Review URL: http://codereview.chromium.org/10086023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133607 0039d316-1c4b-4281-b951-d872f2087c98