Make a mojo:apptests GN meta-target, add apptests.

Make a mojo:apptests GN meta-target, add apptests.

Add an apptest meta-target in mojo/BUILD.gn.
Move the apptests targets specified in src/BUILD.gn.
Add the remaining apptest targets (clipboard, VM, WM).

Was limited to release, allow debug, but exclude component.
See gn_debug compile error from including component build in PS2:
  FAILED: /b/build/slave/linux_chromium_gn/build/src/buildtools/linux64/gn --root=/b/build/slave/linux_chromium_gn/build/src -q gen //out/Debug/
  ERROR at //mojo/shell/BUILD.gn:13:1: Assertion failed.
  assert(!is_component_build)

BUG=NONE
TEST=Building mojo:apptests builds all local apptest binaries (on dbg too!).
R=sky@chromium.org
TBR=ben@chromium.org

Committed: https://crrev.com/16b112790f541670d5f2ab97dfa70c8b89b44b1f
Cr-Commit-Position: refs/heads/master@{#325570}

[msw, 2015-04-16 20:24:12]

Patchset #3 (id:40001) has been deleted

[msw, 2015-04-16 20:25:05]

Hey Scott, please take a look; thanks!

[sky, 2015-04-16 20:26:54]

LGTM

[msw, 2015-04-16 20:36:46]

The CQ bit was checked by msw@chromium.org

[commit-bot: I haz the power, 2015-04-16 20:39:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1050233005/60001

[commit-bot: I haz the power, 2015-04-16 20:56:19]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-04-16 20:56:20]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[msw, 2015-04-16 21:00:00]

msw@chromium.org changed reviewers:
+ ben@chromium.org

[msw, 2015-04-16 21:00:25]

Ben, take a look for OWNERS as you have time; landing.

[msw, 2015-04-16 21:00:35]

The CQ bit was checked by msw@chromium.org

[commit-bot: I haz the power, 2015-04-16 21:00:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1050233005/60001

[commit-bot: I haz the power, 2015-04-17 00:45:41]

Committed patchset #3 (id:60001)

[commit-bot: I haz the power, 2015-04-17 00:46:37]

Patchset 3 (id:??) landed as
https://crrev.com/16b112790f541670d5f2ab97dfa70c8b89b44b1f
Cr-Commit-Position: refs/heads/master@{#325570}

[msw, 2015-04-17 01:51:06]

A revert of this CL (patchset #3 id:60001) has been created in
https://codereview.chromium.org/1093763002/ by msw@chromium.org.

The reason for reverting is: Caused compile failures (many errors, one example
below) on Mac GN bot:
http://build.chromium.org/p/chromium.mac/builders/Mac%20GN/builds/7019/steps/...

gen/mojo/services/html_viewer/blink_resource_map.h:37:58:error: no newline at
end of file [-Werror,-Wnewline-eof]
#endif // MOJO_SERVICES_HTML_VIEWER_BLINK_RESOURCE_MAP_H_.