Add SetClient method implementation to InterfaceImpl.

Add SetClient method implementation to InterfaceImpl.

R=sky@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269917

[darin (slow to review), 2014-05-09 22:57:02]

This was a suggestion by Dave. Previously, ServiceConnection<..> had a client()
method, so this is adding that back, but now it is on InterfaceImpl<..> instead.

(At some point soon, ServiceConnection<..> is going away, but it still remains
for now.)

[sky, 2014-05-12 15:03:46]

LGTM

[darin (slow to review), 2014-05-12 16:05:15]

The CQ bit was checked by darin@chromium.org

[commit-bot: I haz the power, 2014-05-12 16:05:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/darin@chromium.org/280003003/1

[commit-bot: I haz the power, 2014-05-12 17:17:10]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  chromium_presubmit on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/chromium_presubmit/bu...)
  linux_chromium_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_clang_...)

[commit-bot: I haz the power, 2014-05-12 17:20:28]

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

[commit-bot: I haz the power, 2014-05-12 17:20:28]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/chromium_presubmit/bu...)
  linux_chromium_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_clang_...)

[darin (slow to review), 2014-05-12 17:32:39]

The CQ bit was checked by darin@chromium.org

[commit-bot: I haz the power, 2014-05-12 17:33:21]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/darin@chromium.org/280003003/20001

[darin (slow to review), 2014-05-12 17:53:12]

The CQ bit was checked by darin@chromium.org

[commit-bot: I haz the power, 2014-05-12 17:53:40]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/darin@chromium.org/280003003/40001

[darin (slow to review), 2014-05-12 20:32:42]

The CQ bit was checked by darin@chromium.org

[commit-bot: I haz the power, 2014-05-12 20:34:32]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/darin@chromium.org/280003003/60001

[darin (slow to review), 2014-05-12 23:48:13]

Committed patchset #4 manually as r269917 (presubmit successful).