Update from https://crrev.com/316786

cc/trees/proxy.h

Index: cc/trees/proxy.h
diff --git a/cc/trees/proxy.h b/cc/trees/proxy.h
index 2f181fc7688a929f070799f2f93db58aec8decdb..539effeda7a9588414adeea6061c67e3c79e199d 100644
--- a/cc/trees/proxy.h
+++ b/cc/trees/proxy.h
@@ -20,14 +20,8 @@ namespace base {
 namespace trace_event {
 class TracedValue;
 }
-
-// TODO(ssid): remove these aliases after the tracing clients are moved to the
-// new trace_event namespace. See crbug.com/451032. ETA: March 2015
-namespace debug {
-using ::base::trace_event::TracedValue;
-}
 class SingleThreadTaskRunner;
-}  // namespace base
+}
 
 namespace gfx {
 class Rect;
@@ -62,6 +56,7 @@ class CC_EXPORT Proxy {
   virtual void FinishAllRendering() = 0;
 
   virtual bool IsStarted() const = 0;
+  virtual bool CommitToActiveTree() const = 0;
 
   // Will call LayerTreeHost::OnCreateAndInitializeOutputSurfaceAttempted
   // with the result of this function.
@@ -108,7 +103,7 @@ class CC_EXPORT Proxy {
 
   virtual bool SupportsImplScrolling() const = 0;
 
-  virtual void AsValueInto(base::debug::TracedValue* value) const = 0;
+  virtual void AsValueInto(base::trace_event::TracedValue* value) const = 0;
 
   virtual void SetDebugState(const LayerTreeDebugState& debug_state) = 0;