Fix sourcing envsetup.sh under zsh.

Fix sourcing envsetup.sh under zsh.

r262292 moved much of the script under the android_envsetup_main
function.  Since zsh does not define BASH_SOURCE, SCRIPT_DIR ends up
being set to $0, which contains the name of the function.  As a result,
the various paths are computed incorrectly under when envsetup.sh is
sourced from zsh.
BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=276931

[Nico, 2014-06-12 22:08:36]

lgtm, but you shouldn't have to source this file for much any more anyways

[rickyz (Google), 2014-06-12 22:27:00]

On 2014/06/12 22:08:36, Nico (away) wrote:
> lgtm, but you shouldn't have to source this file for much any more anyways

Thanks!  Out of curiosity, is there a newer way to run Android tests locally
that I might not know about?

I've been doing:
./build/android/avd.py --abi arm
build/android/test_runner.py gtest -s sandbox_linux_unittests

which is why I was sourcing envsetup.sh.

[rickyz (Google), 2014-06-12 22:27:02]

The CQ bit was checked by rickyz@google.com

[commit-bot: I haz the power, 2014-06-12 22:30:34]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rickyz@google.com/330513007/1

[commit-bot: I haz the power, 2014-06-13 05:15:51]

Change committed as 276931

[Nico, 2014-06-20 18:13:11]

On 2014/06/12 22:27:00, Ricky Zhou wrote:
> On 2014/06/12 22:08:36, Nico (away) wrote:
> > lgtm, but you shouldn't have to source this file for much any more anyways
> 
> Thanks!  Out of curiosity, is there a newer way to run Android tests locally
> that I might not know about?
> 
> I've been doing:
> ./build/android/avd.py --abi arm
> build/android/test_runner.py gtest -s sandbox_linux_unittests
> 
> which is why I was sourcing envsetup.sh.

What goes wrong if you don't source envsetup?

[rickyz (Google), 2014-06-23 22:04:25]

On 2014/06/20 18:13:11, Nico (away) wrote:
> On 2014/06/12 22:27:00, Ricky Zhou wrote:
> > On 2014/06/12 22:08:36, Nico (away) wrote:
> > > lgtm, but you shouldn't have to source this file for much any more anyways
> > 
> > Thanks!  Out of curiosity, is there a newer way to run Android tests locally
> > that I might not know about?
> > 
> > I've been doing:
> > ./build/android/avd.py --abi arm
> > build/android/test_runner.py gtest -s sandbox_linux_unittests
> > 
> > which is why I was sourcing envsetup.sh.
> 
> What goes wrong if you don't source envsetup?

If I don't source envsetup, I get the following error because the script cannot
find adb (I do not have adb on my system other than the copy in
third_party/android_tools/sdk/platform-tools/adb):

% ./build/android/avd.py --abi arm
# 2014-06-23 14:57:06,234: [host]>
/usr/local/google/home/rickyz/chromium_android/src/android_emulator_sdk/sdk/tools/android
list
# 2014-06-23 14:57:18,061: Emulator launch 0 with avd_name=run_tests_avd_0 and
api=19
# 2014-06-23 14:57:18,061: Create AVD command:
/usr/local/google/home/rickyz/chromium_android/src/android_emulator_sdk/sdk/tools/android
--silent create avd --name run_tests_avd_0 --abi armeabi-v7a --target android-19
--sdcard 512M --force
# 2014-06-23 14:57:22,735: [host]> adb devices
Traceback (most recent call last):
  File "./build/android/avd.py", line 96, in <module>
    sys.exit(main(sys.argv))
  File "./build/android/avd.py", line 91, in main
    options.api_level, True)
  File
"/usr/local/google/home/rickyz/chromium_android/src/build/android/pylib/utils/emulator.py",
line 172, in LaunchTempEmulators
    emulator.Launch(kill_all_emulators=n == 0)
  File
"/usr/local/google/home/rickyz/chromium_android/src/build/android/pylib/utils/emulator.py",
line 336, in Launch
    _KillAllEmulators()  # just to be sure
  File
"/usr/local/google/home/rickyz/chromium_android/src/build/android/pylib/utils/emulator.py",
line 92, in _KillAllEmulators
    emulators = android_commands.GetAttachedDevices(hardware=False)
  File
"/usr/local/google/home/rickyz/chromium_android/src/build/android/pylib/android_commands.py",
line 157, in GetAttachedDevices
    'devices'])
  File
"/usr/local/google/home/rickyz/chromium_android/src/build/android/pylib/cmd_helper.py",
line 67, in GetCmdOutput
    (_, output) = GetCmdStatusAndOutput(args, cwd, shell)
  File
"/usr/local/google/home/rickyz/chromium_android/src/build/android/pylib/cmd_helper.py",
line 99, in GetCmdStatusAndOutput
    shell=shell, cwd=cwd)
  File
"/usr/local/google/home/rickyz/chromium_android/src/build/android/pylib/cmd_helper.py",
line 27, in Popen
    preexec_fn=lambda: signal.signal(signal.SIGPIPE, signal.SIG_DFL))
  File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory
zsh: exit 1     ./build/android/avd.py --abi arm