AI 146317: Traverse the frame tree and compute the largest rectangle that holds all
  the frames. If this rectangle is larger than the computed content, make
  the frame's view size equal to the computed total so that the content
  will be the correct size.
  When expanded iframes, set the width and height to the content width and
  height plus the padding and border.
  BUG=1719555

Automated import of CL 146317
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