Suport initializing DRP from cmd line switches.

If there is a command line switch to enable the data reduction proxy, we
will try to initialize the DRP by reading the DRP key from command line.
If the key from command line is empty, use the key embedded in WebView

BUG: 17211028

Change-Id: I496b0d8a9dcd1763d4bbf2065e2d9e996ba6e873
(cherry picked from commit e41c9c1d9c3bf72381f8e0acd62bd17346bf1d7e)
1 file changed
tree: d1c65ee3be6548d920538a64f8ddb03472664389
  2. chromium/
  3. nullwebview/