Add |GraphicsLayerDebugInfo::getAnnotatedInvalidationRects|

Source/platform/graphics/FirstPaintInvalidationTracking.cpp

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "platform/graphics/FirstPaintInvalidationTracking.h"
+
+#include "platform/TraceEvent.h"
+
+namespace blink {
+
+static bool showPaintRectsEnabled = false;
+
+bool firstPaintInvalidationTrackingEnabled()
+{
+    if (showPaintRectsEnabled)
+        return true;
+
+    bool isTracingEnabled;
+    TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT("blink.invalidation"), &isTracingEnabled);
+    return isTracingEnabled;
+}
+
+void setFirstPaintInvalidationTrackingEnabledForShowPaintRects(bool b)
+{
+    showPaintRectsEnabled = b;
+}
+
+}