Size reduction from moving const char arrays out of header

cc/debug/devtools_instrumentation.cc

+// Copyright 2016 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 "cc/debug/devtools_instrumentation.h"
+
+namespace cc {
+namespace devtools_instrumentation {
+
+namespace internal {
+extern const char kCategory[] = TRACE_DISABLED_BY_DEFAULT("devtools.timeline");
+extern const char kCategoryFrame[] =
+    TRACE_DISABLED_BY_DEFAULT("devtools.timeline.frame");
+extern const char kData[] = "data";
+extern const char kFrameId[] = "frameId";
+extern const char kLayerId[] = "layerId";
+extern const char kLayerTreeId[] = "layerTreeId";
+extern const char kPixelRefId[] = "pixelRefId";
+
+extern const char kImageDecodeTask[] = "ImageDecodeTask";
+extern const char kBeginFrame[] = "BeginFrame";
+extern const char kNeedsBeginFrameChanged[] = "NeedsBeginFrameChanged";
+extern const char kActivateLayerTree[] = "ActivateLayerTree";
+extern const char kRequestMainThreadFrame[] = "RequestMainThreadFrame";
+extern const char kBeginMainThreadFrame[] = "BeginMainThreadFrame";
+extern const char kDrawFrame[] = "DrawFrame";
+extern const char kCompositeLayers[] = "CompositeLayers";
+}  // namespace internal
+
+extern const char kPaintSetup[] = "PaintSetup";
+extern const char kUpdateLayer[] = "UpdateLayer";
+
+}  // namespace devtools_instrumentation
+}  // namespace cc