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Slightly modified from noelallen's codereview.chromium.org/10823177.
My changes: style nits, as well as fixing pnacl builds
original CL description follows:

This CL adds support for Debug and Release configs.
It moves functions that require knowledge of the Makefile to make_rules.py and
keeps functions that require understanding of the DSC files in
generate_make.py.

It adds a 'config' parameter to the embed in common.js.
Updates all index.html files to support the new config parameter.

make_rules.py has been converted to a class. This allows the object to persist
state about the build which allows us to remove knowledge of the make rules
from generate_make.py.

BUG=none
TBR=noelallen@chromium.org
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/10828187

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150289 0039d316-1c4b-4281-b951-d872f2087c98