CC: Force push properties for all layers when tracing is started

... provided categories that cause layer tree snapshots to be traced
are enabled. We need this so that we can show owner nodes for layers
that were not updated on the main thread side for a while.

BUG=

Review URL: https://codereview.chromium.org/924973003

Cr-Commit-Position: refs/heads/master@{#320947}

1 files changed, 12 insertions, 0 deletions

diff --git a/cc/debug/frame_viewer_instrumentation.cc b/cc/debug/frame_viewer_instrumentation.cc
index 53c1551..226cc88 100644
--- a/cc/debug/frame_viewer_instrumentation.cc
+++ b/cc/debug/frame_viewer_instrumentation.cc
@@ -6,6 +6,12 @@
 
 namespace cc {
 namespace frame_viewer_instrumentation {
+
+const char kCategoryLayerTree[] =
+    TRACE_DISABLED_BY_DEFAULT("cc.debug") ","
+    TRACE_DISABLED_BY_DEFAULT("cc.debug.quads") ","
+    TRACE_DISABLED_BY_DEFAULT("devtools.timeline.layers");
+
 namespace {
 
 const char kCategory[] = "cc," TRACE_DISABLED_BY_DEFAULT("devtools.timeline");
@@ -60,5 +66,11 @@ ScopedRasterTask::~ScopedRasterTask() {
   TRACE_EVENT_END0(kCategory, kRasterTask);
 }
 
+bool IsTracingLayerTreeSnapshots() {
+  bool category_enabled;
+  TRACE_EVENT_CATEGORY_GROUP_ENABLED(kCategoryLayerTree, &category_enabled);
+  return category_enabled;
+}
+
 }  // namespace frame_viewer_instrumentation
 }  // namespace cc