WebRTC fetch recipe: Always sync branch heads.

WebRTC fetch recipe: Always sync branch heads.

This will make gclient download all the remote branches of
the WebRTC Git repo when the 'fetch webrtc' recipe runs.
This will result in a new fetch line in the .git/config for
branch-heads, like this:
[remote "origin"]
  url = https://chromium.googlesource.com/external/webrtc.git
  fetch = +refs/heads/*:refs/remotes/origin/*
  fetch = +refs/branch-heads/*:refs/remotes/branch-heads/*

In order to get the same setup for an existing checkout, do:
gclient sync --with_branch_heads
git fetch origin

BUG=437776
TESTED=Ran 'fetch webrtc' and 'fetch webrtc_ios' and verified
the remote branches were available with 'git branch --remotes'

R=jochen@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=294528

[kjellander_chromium, 2015-03-23 08:48:01]

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

[jochen (gone - plz use gerrit), 2015-03-23 12:27:15]

lgtm

[kjellander_chromium, 2015-03-23 12:29:32]

The CQ bit was checked by kjellander@chromium.org

[commit-bot: I haz the power, 2015-03-23 12:29:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1030573002/1

[commit-bot: I haz the power, 2015-03-23 12:32:59]

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

[commit-bot: I haz the power, 2015-03-23 12:33:00]

Presubmit check for 1030573002-1 failed and returned exit status 1.

Running presubmit commit checks ...
Checking out rietveld...
Running save-description-on-failure.sh
Running push-basic.sh
Running upstream.sh
Running submit-from-new-dir.sh
Running abandon.sh
Running submodule-merge-test.sh
Running upload-local-tracking-branch.sh
Running hooks.sh
Running post-dcommit-hook-test.sh
Running upload-stale.sh
Running patch.sh
Running basic.sh

** Presubmit ERRORS **
tests/gclient_smoketest.py (53.67s) failed
Ffatal: reference is not a tree: fea68a5ebb65a7d5a7ca237fa68a88266f4fe339
EE..............................................
======================================================================
ERROR: testBlinkDEPSChangeUsingGit (__main__.BlinkDEPSTransitionSmokeTest)
Like testBlinkDEPSChangeUsingGclient, but move the main project using
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/gclient_smoketest.py", line 1630, in testBlinkDEPSChangeUsingGit
    cwd=self.checkout_path)
  File
"/b/infra_internal/commit_queue/workdir/tools/depot_tools/subprocess2.py", line
484, in check_call
    check_call_out(args, **kwargs)
  File
"/b/infra_internal/commit_queue/workdir/tools/depot_tools/subprocess2.py", line
478, in check_call_out
    returncode, args, kwargs.get('cwd'), out[0], out[1])
CalledProcessError: Command git checkout -q
fea68a5ebb65a7d5a7ca237fa68a88266f4fe339 returned non-zero exit status 128 in
/tmp/trialwq8FeX/__main__.BlinkDEPSTransitionSmokeTest.testBlinkDEPSChangeUsingGit/src

======================================================================
ERROR: testBlinkLocalBranchesArePreserved
(__main__.BlinkDEPSTransitionSmokeTest)
Checks that the state of local git branches are effectively preserved
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/gclient_smoketest.py", line 1656, in
testBlinkLocalBranchesArePreserved
    self.CheckStatusPreMergePoint()
  File "tests/gclient_smoketest.py", line 1558, in CheckStatusPreMergePoint
    self.blink), self.blink_git_url)
  File "/b/infra_internal/commit_queue/workdir/tools/depot_tools/scm.py", line
121, in Capture
    cwd=cwd, stderr=subprocess2.PIPE, env=env, **kwargs)
  File
"/b/infra_internal/commit_queue/workdir/tools/depot_tools/subprocess2.py", line
515, in check_output
    return check_call_out(args, stdout=PIPE, **kwargs)[0]
  File
"/b/infra_internal/commit_queue/workdir/tools/depot_tools/subprocess2.py", line
475, in check_call_out
    out, returncode = communicate(args, **kwargs)
  File
"/b/infra_internal/commit_queue/workdir/tools/depot_tools/subprocess2.py", line
449, in communicate
    proc = Popen(args, **kwargs)
  File
"/b/infra_internal/commit_queue/workdir/tools/depot_tools/subprocess2.py", line
253, in __init__
    % (str(e), kwargs.get('cwd'), args[0]))
OSError: Execution failed with error: [Errno 2] No such file or directory:
'/tmp/trialwq8FeX/__main__.BlinkDEPSTransitionSmokeTest.testBlinkLocalBranchesArePreserved/src/third_party/WebKit'.
Check that
/tmp/trialwq8FeX/__main__.BlinkDEPSTransitionSmokeTest.testBlinkLocalBranchesArePreserved/src/third_party/WebKit
or git exist and have execution permission.

======================================================================
FAIL: testBlinkDEPSChangeUsingGclient (__main__.BlinkDEPSTransitionSmokeTest)
Checks that {src,blink} repos are consistent when syncing going back and
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/gclient_smoketest.py", line 1601, in
testBlinkDEPSChangeUsingGclient
    self.assertEqual(res[2], 0, 'DEPS change sync failed.')
AssertionError: DEPS change sync failed.

----------------------------------------------------------------------
Ran 49 tests in 53.471s

FAILED (failures=1, errors=2)


Presubmit checks took 187.8s to calculate.

[kjellander_chromium, 2015-03-23 13:30:17]

Committed patchset #1 (id:1) manually as 294528.