Teach chromium_roll script to roll v8 git hashes.

TEST=script_test.py
R=hinoka@google.com

Review URL: https://codereview.chromium.org/504793002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23379 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/push-to-trunk/chromium_roll.py

@@ -84,11 +84,9 @@ class UploadCL(Step):
     os.chdir(self["chrome_path"])
 
     # Patch DEPS file.
-    deps = FileToText(self.Config(DEPS_FILE))
-    deps = re.sub("(?<=\"v8_revision\": \")([0-9]+)(?=\")",
-                  self["trunk_revision"],
-                  deps)
-    TextToFile(deps, self.Config(DEPS_FILE))
+    if self._side_effect_handler.Command(
+        "roll-dep", "v8 %s" % self["trunk_revision"]) is None:
+      self.Die("Failed to create deps for %s" % self["trunk_revision"])
 
     if self._options.reviewer and not self._options.manual:
       print "Using account %s for review." % self._options.reviewer

tools/push-to-trunk/test_scripts.py

@@ -369,6 +369,7 @@ class ScriptTest(unittest.TestCase):
 
   MOCKS = {
     "git": GitMock,
+    "roll-dep": GitMock, # TODO(machenbach): Yet another hack. Unify all mocks.
     # TODO(machenbach): Little hack to reuse the git mock for the one svn call
     # in merge-to-branch. The command should be made explicit in the test
     # expectations.
@@ -834,6 +835,9 @@ def get_list():
       os.makedirs(TEST_CONFIG[CHROMIUM])
     TextToFile("Some line\n   \"v8_revision\": \"123444\",\n  some line",
                TEST_CONFIG[DEPS_FILE])
+    def WriteDeps():
+      TextToFile("Some line\n   \"v8_revision\": \"123455\",\n  some line",
+                 TEST_CONFIG[DEPS_FILE])
 
     os.environ["EDITOR"] = "vi"
     force_flag = " -f" if not manual else ""
@@ -851,6 +855,7 @@ def get_list():
       Git("checkout -f master", ""),
       Git("pull", ""),
       Git("checkout -b v8-roll-123455", ""),
+      Git("v8 123455", "rolled", cb=WriteDeps),
       Git(("commit -am \"Update V8 to version 3.22.5 "
            "(based on bleeding_edge revision r123454).\n\n"
            "Please reply to the V8 sheriff c_name@chromium.org in "