Migrate dartium_tools from chrome branch to dart repo

tools/dartium/fetch_reference_build.py

Index: tools/dartium/fetch_reference_build.py
diff --git a/tools/bots/fetch_reference_build.py b/tools/dartium/fetch_reference_build.py
similarity index 91%
copy from tools/bots/fetch_reference_build.py
copy to tools/dartium/fetch_reference_build.py
index 9ca6f5dafc91fe410466b1c7781371f0a4333522..077d49cd92353b105f3310f634b38596677145bf 100755
--- a/tools/bots/fetch_reference_build.py
+++ b/tools/dartium/fetch_reference_build.py
@@ -11,7 +11,7 @@
   Must be run from the root of a Dartium or multivm checkout.
 
 Usage:
-  $ ./src/dart/tools/bots/fetch_reference_build_revision.py
+  $ ./src/dart/tools/dartium/fetch_reference_build_revision.py

[Bill Hesse, 2014/05/01 15:12:01]

Is this CL leaving the existing copies in tools/bots?

If so, then a later CL on the buildbot needs to change
build/scripts/slave/recipes/dart/dartium_perf.py to change the
location of the script, and then the multivm checkout of dart/tools/bots
can be replaced by a checkout of dart/tools/dartium.

Then the copies in tools/bots can be removed.

[vsm, 2014/05/02 16:25:50]

Yes, I'm not touching the files under bots.  We can also delete these in the
dartium directory in favor of the ones in bots.  Your call.

On 2014/05/01 15:12:01, Bill Hesse wrote:

 """
 
 import os
@@ -35,7 +35,7 @@ def main(argv):
       return
 
   get_script = os.path.join('src', 'dart', 'tools',
-                            'bots', 'get_chromium_build.py')
+                            'dartium', 'get_chromium_build.py')
   get_script = os.path.abspath(get_script)
   exit_code = subprocess.call(['python', get_script,
                                '-r', request_revision,