Add layer name into frame viewer

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index eb50b61cbe12936bd9d0dfde9ac04e4b7bdef212..8692c6b69161f7457b39a61e9930a6dc56569f23 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -1142,6 +1142,9 @@ CompositingReasonsAsValue(CompositingReasons reasons) {
 void LayerImpl::AsValueInto(base::DictionaryValue* state) const {
   TracedValue::MakeDictIntoImplicitSnapshot(state, LayerTypeAsString(), this);
   state->SetInteger("layer_id", id());
+#ifndef NDEBUG
+  state->SetString("layer_name", debug_name());

[enne (OOO), 2013/06/18 16:45:56]

On second thought, how about if (!debug_name().empty()) without any #ifdefs? Not
all layers have names even in debug builds either.

+#endif
   state->Set("bounds", MathUtil::AsValue(bounds()).release());
   state->SetInteger("draws_content", DrawsContent());
   state->SetInteger("gpu_memory_usage", GPUMemoryUsageInBytes());