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NOTE: This is a revival/continuation of https://codereview.chromium.org/333723004, which was started by another developer.

The cc:CopyOutputRequest object assumes the src_subrect region is
in DIP space.  Thus, all calling code should provide the same.

Fixed tests in render_widget_host_view_browsertest.cc that were
completing successfully, even though the implementation was broken
for the high DPI scenarios.

In addition, I updated a number of interface comments to clarify the
difference between src_subrect being in DIP coordinates versus the
dest_size being in physical pixel coordinates.

Dependent on: https://codereview.chromium.org/311253004 (landed at r276139)

BUG=397708,399349

Review URL: https://codereview.chromium.org/462173002

Cr-Commit-Position: refs/heads/master@{#289509}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289509 0039d316-1c4b-4281-b951-d872f2087c98