Moved the cross-project parts of trace_event.h to trace_event_common.h

Moved the cross-project parts of trace_event.h to trace_event_common.h

This means other projects can copy it unmodified and keep their implementation details in trace_event.h

trace_event_common.h also has some additional macros that were only found in the Blink copy of trace_event_.h previously.

R=dsinclair
BUG=

Committed: https://crrev.com/e6e9521480c9c321f7e046da7a63ba9a0802f861
Cr-Commit-Position: refs/heads/master@{#341834}

[oystein (OOO til 10th of July), 2015-07-31 21:56:58]

oysteine@chromium.org changed reviewers:
+ dsinclair@chromium.org

[oystein (OOO til 10th of July), 2015-07-31 21:57:19]

Patchset #1 (id:1) has been deleted

[oystein (OOO til 10th of July), 2015-07-31 21:57:30]

ptal!

[oystein (OOO til 10th of July), 2015-08-01 00:24:59]

oysteine@chromium.org changed reviewers:
+ shatch@chromium.org

[dsinclair, 2015-08-04 18:31:54]

What were the blink only macros?

[oystein (OOO til 10th of July), 2015-08-04 18:40:47]

On 2015/08/04 18:31:54, dsinclair wrote:
> What were the blink only macros?

TRACE_EVENT_SET_NONCONST_SAMPLING_STATE, TRACE_EVENT_MARK_* and
TRACE_EVENT_NESTABLE_ASYNC_END1 I think.

[dsinclair, 2015-08-04 20:08:04]

lgtm

[oystein (OOO til 10th of July), 2015-08-04 20:13:00]

The CQ bit was checked by oysteine@chromium.org

[commit-bot: I haz the power, 2015-08-04 20:13:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1256263006/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1256263006/20001

[commit-bot: I haz the power, 2015-08-04 22:16:01]

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

[commit-bot: I haz the power, 2015-08-04 22:16:02]

Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[oystein (OOO til 10th of July), 2015-08-04 22:21:26]

The CQ bit was checked by oysteine@chromium.org

[commit-bot: I haz the power, 2015-08-04 22:22:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1256263006/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1256263006/20001

[commit-bot: I haz the power, 2015-08-05 01:06:52]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2015-08-05 01:08:16]

Patchset 1 (id:??) landed as
https://crrev.com/e6e9521480c9c321f7e046da7a63ba9a0802f861
Cr-Commit-Position: refs/heads/master@{#341834}