Scrub peripheral serial numbers from logs

Add a new pattern to detect and scrub serial numbers logged in
/var/log/messages

BUG=714802
TEST=components_unittests --gtest_filter=AnonymizerToolTest.AnonymizeCustomPatterns

Review-Url: https://codereview.chromium.org/2842263005
Cr-Commit-Position: refs/heads/master@{#468334}

components/feedback/anonymizer_tool.cc

@@ -41,11 +41,12 @@ namespace {
 // (?-s) turns off "dot matches newline" for the remainder of the regex.
 // (?:regex) denotes non-capturing parentheses group.
 const char* kCustomPatternsWithContext[] = {
-    "(\\bCell ID: ')([0-9a-fA-F]+)(')",                  // ModemManager
-    "(\\bLocation area code: ')([0-9a-fA-F]+)(')",       // ModemManager
-    "(?i-s)(\\bssid[= ]')(.+)(')",                       // wpa_supplicant
-    "(?-s)(\\bSSID - hexdump\\(len=[0-9]+\\): )(.+)()",  // wpa_supplicant
-    "(?-s)(\\[SSID=)(.+?)(\\])",                         // shill
+    "(\\bCell ID: ')([0-9a-fA-F]+)(')",                      // ModemManager
+    "(\\bLocation area code: ')([0-9a-fA-F]+)(')",           // ModemManager
+    "(?i-s)(\\bssid[= ]')(.+)(')",                           // wpa_supplicant
+    "(?-s)(\\bSSID - hexdump\\(len=[0-9]+\\): )(.+)()",      // wpa_supplicant
+    "(?-s)(\\[SSID=)(.+?)(\\])",                             // shill
+    "(?i-s)(serial\\s*number\\s*:\\s*)([0-9a-zA-Z\\-]+)()",  // Serial numbers
 };
 
 // Helper macro: Non capturing group

components/feedback/anonymizer_tool_unittest.cc

@@ -95,6 +95,13 @@ TEST_F(AnonymizerToolTest, AnonymizeCustomPatterns) {
       "a\nb [SSID=1] [SSID=2] [SSID=foo\nbar] b",
       AnonymizeCustomPatterns("a\nb [SSID=foo] [SSID=bar] [SSID=foo\nbar] b"));
 
+  EXPECT_EQ("SerialNumber: 1",
+            AnonymizeCustomPatterns("SerialNumber: 1217D7EF"));
+  EXPECT_EQ("serial  number: 2",
+            AnonymizeCustomPatterns("serial  number: 50C971FEE7F3x010900"));
+  EXPECT_EQ("SerialNumber: 3",
+            AnonymizeCustomPatterns("SerialNumber: EVT23-17BA01-004"));
+
   EXPECT_EQ("<email: 1>",
             AnonymizeCustomPatterns("foo@bar.com"));
   EXPECT_EQ("Email: <email: 1>.",