Added git hyper-blame, a tool that skips unwanted commits in git blame.

tests/git_common_test.py

Index: tests/git_common_test.py
diff --git a/tests/git_common_test.py b/tests/git_common_test.py
index 76a91520dcee4ec73a67d31385725665ac6be6c0..25b8dc77b05747490a5d692167dc0dce9db755b3 100755
--- a/tests/git_common_test.py
+++ b/tests/git_common_test.py
@@ -176,15 +176,15 @@ class GitReadOnlyFunctionsTest(git_test_utils.GitRepoReadOnlyTestBase,
   COMMIT_C = {
     'some/files/file2': {
       'mode': 0755,
-      'data': 'file2 - vanilla'},
+      'data': 'file2 - vanilla\n'},
   }
 
   COMMIT_E = {
-    'some/files/file2': {'data': 'file2 - merged'},
+    'some/files/file2': {'data': 'file2 - merged\n'},
   }
 
   COMMIT_D = {
-    'some/files/file2': {'data': 'file2 - vanilla\nfile2 - merged'},
+    'some/files/file2': {'data': 'file2 - vanilla\nfile2 - merged\n'},
   }
 
   def testHashes(self):
@@ -259,6 +259,18 @@ class GitReadOnlyFunctionsTest(git_test_utils.GitRepoReadOnlyTestBase,
     self.repo.git('config', 'branch.master.dormant', 'true')
     self.assertTrue(self.repo.run(self.gc.is_dormant, 'master'))
 
+  def testBlame(self):
+    # Expect to blame line 1 on C, line 2 on E.
+    c_short = self.repo['C'][:8]
+    c_author = self.repo.show_commit('C', format_string='%an %ai')
+    e_short = self.repo['E'][:8]
+    e_author = self.repo.show_commit('E', format_string='%an %ai')
+    expected_output = ['%s (%s 1) file2 - vanilla' % (c_short, c_author),
+                       '%s (%s 2) file2 - merged' % (e_short, e_author)]
+    self.assertEqual(expected_output,
+                     self.repo.run(self.gc.blame, 'some/files/file2',
+                                   'tag_D').split('\n'))
+
   def testParseCommitrefs(self):
     ret = self.repo.run(
       self.gc.parse_commitrefs, *[