crash-reporter: Add a new Chrome thread to ignore

A bunch of "supplied_MediaPipeline" crashes are showing up for product
"Chrome_ChromeOS", so add "MediaPipeline" as a thread name to ignore as a
Chrome crash.

BUG=chrome-os-partner:16165
TEST=Ran unittests

Change-Id: Iadcba53400c63b1e7fe93d7f1e74c8dd5c37ebd9
Reviewed-on: https://gerrit.chromium.org/gerrit/38673
Commit-Ready: Michael Krebs <mkrebs@chromium.org>
Tested-by: Michael Krebs <mkrebs@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
diff --git a/crash_reporter/user_collector.cc b/crash_reporter/user_collector.cc
index d3ee66d..ed3fcf5 100644
--- a/crash_reporter/user_collector.cc
+++ b/crash_reporter/user_collector.cc
@@ -532,6 +532,8 @@
 static bool IsChromeExecName(const std::string &exec) {
   static const char *kChromeNames[] = {
     "chrome",
+    /* These are additional thread names seen in http://crash/ */
+    "MediaPipeline",
     /* These come from the use of base::PlatformThread::SetName() directly */
     "CrBrowserMain", "CrRendererMain", "CrUtilityMain", "CrPPAPIMain",
     "CrPPAPIBrokerMain", "CrPluginMain", "CrWorkerMain", "CrGpuMain",