reland of http://crrev.com/212230 Create top-level separate targets for...

reland of http://crrev.com/212230 Create top-level separate targets for...

Original CL here: https://codereview.chromium.org/17619005/

Changed since previous landing is diff between ps1 and ps2.
Diff since previous landing is a bit noisy, but in those files
against original is relatively small. The conditions for the 
defines were incorrect and are simpler (and correct) now.


Previously:

Create top-level separate targets for browser and child dlls

The general idea is that there's top level targets chrome and chrome_child,
and corresponding content_app and content_app_child that depend on only
the subtargets that should be included in the appropriate dll.

Currently (probably) Windows-only and requires setting chrome_multiple_dll=1
for gyp.

Links, but Blink is still included in browser.

Single-process mode is currently disabled when chrome_multiple_dll is set.

Current graph is at:
http://commondatastorage.googleapis.com/chromelinkgraph/deps.html generated by
"python tools\win\split_link\graph_dependencies.py deps.html"

Remove the previous hacky-er attempt at this that was named "split dll".

TBR=jam@chromium.org
BUG=237249, 256965
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=212415

[scottmg, 2013-07-18 20:37:35]

Committed patchset #2 manually as r212415 (presubmit successful).