Make Blink test targets generally visible.

Make Blink test targets generally visible.

This makes heap_unittests, platform_unittests and wtf_unittests targets
public, so we can refer to them outside of Blink, in Chromium's root
BUILD.gn file.

Tested with the following command line:

$ gn gen ../../out_gn/Debug
$ ninja -C ../../out_gn/Debug all_blink

With the following diff in Chromium's BUILD.gn to test the new behavior.
+group("gn_all") {
+  # This should not be linked into production and depends on test targets.
+  testonly = true
+
+  deps = [
+    "//third_party/WebKit/public:blink_tests",
+  ]
+}

BUG=None
TEST=see above
R=dpranke@chromium.org
TBR=jochen@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=189894

[tfarina, 2015-02-09 22:34:03]

Is there a better visibility than [*] that I should apply?

[Dirk Pranke, 2015-02-09 22:45:27]

This is the change I was initially thinking of.

However, Brett may have convinced me that it would be better to add a
"blink_tests" target into public (that depends on the specific binaries) and
change all_gn to depend on that.

It's kind of six-of-one, half-dozen of the other, but I guess I'd probably vote
for blink_tests instead.

[tfarina, 2015-02-10 00:23:43]

Changed to blink_tests. Please, take another look.

[Dirk Pranke, 2015-02-10 00:39:55]

lgtm

[tfarina, 2015-02-10 11:31:07]

tfarina@chromium.org changed reviewers:
+ jochen@chromium.org

[tfarina, 2015-02-10 11:31:20]

TBRing Jochen for this...

[tfarina, 2015-02-10 11:32:00]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-02-10 11:32:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/910973002/40001

[commit-bot: I haz the power, 2015-02-10 12:46:06]

Committed patchset #3 (id:40001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=189894