Android: Fix stability proto renderer rate

Only increment stability proto renderer crash rate if the crash dump is
valid.

BUG=786992

Change-Id: I63e4d24bdd9d258775bba21b611414770424d57c
Reviewed-on: https://chromium-review.googlesource.com/779480
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517890}

chrome/browser/metrics/chrome_stability_metrics_provider.cc

@@ -143,7 +143,9 @@ void ChromeStabilityMetricsProvider::OnCrashDumpProcessed(
     const breakpad::CrashDumpManager::CrashDumpDetails& details) {
   // There is a delay for OOM flag to be removed when app goes to background, so
   // we can't just check for OOM_PROTECTED flag.
-  if (details.process_type == content::PROCESS_TYPE_RENDERER &&
+  if (details.status ==
+          breakpad::CrashDumpManager::CrashDumpStatus::kValidDump &&
+      details.process_type == content::PROCESS_TYPE_RENDERER &&
       details.termination_status == base::TERMINATION_STATUS_OOM_PROTECTED &&
       (details.app_state ==
            base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES ||