Chromium -> Mojo roll.

cc/debug/frame_viewer_instrumentation.h

Index: cc/debug/frame_viewer_instrumentation.h
diff --git a/cc/debug/frame_viewer_instrumentation.h b/cc/debug/frame_viewer_instrumentation.h
index 762d058ca5445bf4091d7f3024914e6ab57a0931..b6736be08149a6d45fd87e7a6c1dc906c5728f26 100644
--- a/cc/debug/frame_viewer_instrumentation.h
+++ b/cc/debug/frame_viewer_instrumentation.h
@@ -11,6 +11,8 @@
 namespace cc {
 namespace frame_viewer_instrumentation {
 
+extern const char kCategoryLayerTree[];
+
 class ScopedAnalyzeTask {
  public:
   ScopedAnalyzeTask(const void* tile_id,
@@ -35,6 +37,8 @@ class ScopedRasterTask {
   DISALLOW_COPY_AND_ASSIGN(ScopedRasterTask);
 };
 
+bool IsTracingLayerTreeSnapshots();
+
 }  // namespace frame_viewer_instrumentation
 }  // namespace cc