Make it possible to generate static and dynamic CLD2 libraries in one build.

Make it possible to generate static and dynamic CLD2 libraries in one build.

This is necessary to allow building multiple targets with conflicting
requirements, such as chrome_shell (needing a statically-linked CLD2) at the
same time as the APK for Android (using, e.g., the "component" CLD2 data
source). For more information and background, refer to the linked bug.

This change should be a no-op in all current build configurations, but moves
closer to enabling the behavior described above.

BUG=367239
TBR=toyoshim
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285289

[Andrew Hayden (chromium.org), 2014-07-24 13:30:57]

PTAL. I'll TBR if the bots can confirm correct functionality, as this is purely
a build change.

[Andrew Hayden (chromium.org), 2014-07-24 14:17:55]

I've uploaded a second patchset that fixes the all_dependent_settings for GN
non-static builds. I manually verified that this works by changing feautres.gni
on my local machine and forcing a linux rebuild both with and without the
all_dependent_settings; with it, it works; without it, it fails. As expected.
I'm not going to bother running the second patchset through the bots since it
only affects dynamic mode, which isn't enabled anywhere yet (the bots will give
no useful data beyond what they've already shown for patchset 1, which is that
this is ready to go).

[Andrew Hayden (chromium.org), 2014-07-24 14:33:57]

The CQ bit was checked by andrewhayden@chromium.org

[commit-bot: I haz the power, 2014-07-24 14:35:20]

CQ is trying da patch. Follow status at

https://chromium-status.appspot.com/cq/andrewhayden@chromium.org/416863002/20001

[commit-bot: I haz the power, 2014-07-24 15:58:42]

Change committed as 285289