Making OutputSurface a begin frame source and vsync source.

cc/output/managed_memory_policy.cc

Index: cc/output/managed_memory_policy.cc
diff --git a/cc/output/managed_memory_policy.cc b/cc/output/managed_memory_policy.cc
index 049d2b03f9fcd14768e830c1c931d9a90ffc74da..79b94c3318dbce7c279f4f2b498c68ba93e1f45b 100644
--- a/cc/output/managed_memory_policy.cc
+++ b/cc/output/managed_memory_policy.cc
@@ -77,4 +77,27 @@ ManagedMemoryPolicy::PriorityCutoffToTileMemoryLimitPolicy(
   return ALLOW_NOTHING;
 }
 
+void ManagedMemoryPolicy::AsValueInto(base::debug::TracedValue* dict) const {
+  dict->SetString("type", "ManagedMemoryPolicy");
+  dict->SetInteger("kDefaultNumResourcesLimit", kDefaultNumResourcesLimit);
+  dict->SetInteger("bytes_limit_when_visible", bytes_limit_when_visible);
+  switch (priority_cutoff_when_visible) {
+    case MemoryAllocation::CUTOFF_ALLOW_NOTHING:
+      dict->SetString("prority_cutoff_when_visible", "CUTOFF_ALLOW_NOTHING");
+      break;
+    case MemoryAllocation::CUTOFF_ALLOW_REQUIRED_ONLY:
+      dict->SetString("prority_cutoff_when_visible",
+                      "CUTOFF_ALLOW_REQUIRED_ONLY");
+      break;
+    case MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE:
+      dict->SetString("prority_cutoff_when_visible",
+                      "CUTOFF_ALLOW_NICE_TO_HAVE");
+      break;
+    case MemoryAllocation::CUTOFF_ALLOW_EVERYTHING:
+      dict->SetString("prority_cutoff_when_visible", "CUTOFF_ALLOW_EVERYTHING");
+      break;
+  }
+  dict->SetInteger("num_resources_limit", num_resources_limit);
+}
+
 }  // namespace cc