Group ImageFrame SkBitmap functions and setRGBA functions together
Group ImageFrame SkBitmap functions and setRGBA functions together

Move SkBitmap setters and getters into that area of the code, move the
setRGBA related functions togther, to simplfy an upcoming patch to the
ImageFrame class.  No change in behavior, no new tests.

Review URL: https://chromiumcodereview.appspot.com/18816005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@153669 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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