Bug 1380659 - Introduce code coverage component to dump/reset coverage counters. r=erahm

tools/code-coverage/nsCodeCoverage.cpp

@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsCodeCoverage.h"
+#include "mozilla/CodeCoverageHandler.h"
+#include "mozilla/Unused.h"
+#include "mozilla/dom/ContentParent.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+NS_IMPL_ISUPPORTS(nsCodeCoverage,
+                  nsICodeCoverage)
+
+nsCodeCoverage::nsCodeCoverage()
+{
+}
+
+nsCodeCoverage::~nsCodeCoverage()
+{
+}
+
+NS_IMETHODIMP nsCodeCoverage::DumpCounters()
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+
+  CodeCoverageHandler::DumpCounters(0);
+  for (auto* cp : ContentParent::AllProcesses(ContentParent::eLive)) {
+    Unused << cp->SendDumpCodeCoverageCounters();
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsCodeCoverage::ResetCounters()
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+
+  CodeCoverageHandler::ResetCounters(0);
+  for (auto* cp : ContentParent::AllProcesses(ContentParent::eLive)) {
+    Unused << cp->SendResetCodeCoverageCounters();
+  }
+
+  return NS_OK;
+}