Iteratively increase sample size for good/bad classification.

scripts/slave/recipe_modules/auto_bisect/example.expected/basic.json

Index: scripts/slave/recipe_modules/auto_bisect/example.expected/basic.json
diff --git a/scripts/slave/recipe_modules/auto_bisect/example.expected/basic.json b/scripts/slave/recipe_modules/auto_bisect/example.expected/basic.json
index 0e3dd4d0959833d962cb97ecb06ae35a2bf25105..b9886fa124e7029cb9dc9a3fe7d09d11108abf69 100644
--- a/scripts/slave/recipe_modules/auto_bisect/example.expected/basic.json
+++ b/scripts/slave/recipe_modules/auto_bisect/example.expected/basic.json
@@ -287,7 +287,7 @@
             "command": "src/tools/perf/run_benchmark -v --browser=release smoothness.tough_scrolling_cases",
             "max_time_minutes": "5",
             "metric": "mean_input_event_latency/mean_input_event_latency",
-            "repeat_count": "2",
+            "repeat_count": 3,
             "test_type": "perf"
           },
           "job_name": "a6298e4afedbf2cd461755ea6f45b0ad64222222-test",
@@ -324,7 +324,7 @@
             "command": "src/tools/perf/run_benchmark -v --browser=release smoothness.tough_scrolling_cases",
             "max_time_minutes": "5",
             "metric": "mean_input_event_latency/mean_input_event_latency",
-            "repeat_count": "2",
+            "repeat_count": 3,
             "test_type": "perf"
           },
           "job_name": "00316c9ddfb9d7b4e1ed2fff9fe6d964d2111111-test",
@@ -509,7 +509,7 @@
             "command": "src/tools/perf/run_benchmark -v --browser=release smoothness.tough_scrolling_cases",
             "max_time_minutes": "5",
             "metric": "mean_input_event_latency/mean_input_event_latency",
-            "repeat_count": "2",
+            "repeat_count": 3,
             "test_type": "perf"
           },
           "job_name": "dcdcdc0ff1122212323134879ddceeb1240b0988-test",
@@ -567,6 +567,40 @@
   },
   {
     "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[auto_bisect]/resources/significantly_different.py",
+      "[19, 20, 21]",
+      "[14, 15, 16]",
+      "0.05"
+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "name": "Checking sample difference",
+    "stdout": "/path/to/tmp/json",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output (invalid)@null@@@",
+      "@@@STEP_LOG_END@json.output (invalid)@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[auto_bisect]/resources/significantly_different.py",
+      "[14, 15, 16]",
+      "[14, 15, 16]",
+      "0.05"
+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "name": "Checking sample difference (2)",
+    "stdout": "/path/to/tmp/json",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output (invalid)@null@@@",
+      "@@@STEP_LOG_END@json.output (invalid)@@@"
+    ]
+  },
+  {
+    "cmd": [
       "git",
       "show",
       "--name-only",