Use LatencyInfoSwapPromise to track LatencyInfo through compositor

cc/trees/layer_tree_host_unittest.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/synchronization/lock.h"
@@ skipping 5214 matching lines @@
 
   bool did_swap_called;
   bool did_not_swap_called;
   bool dtor_called;
   SwapPromise::DidNotSwapReason reason;
 };
 
 class TestSwapPromise : public SwapPromise {
  public:
   explicit TestSwapPromise(TestSwapPromiseResult* result)
-      : result_(result) {
+      : SwapPromise(SWAP_PROMISE_UNKNOWN),
+        result_(result) {
   }
 
   virtual ~TestSwapPromise() {
     result_->dtor_called = true;
   }
 
   virtual void DidSwap() OVERRIDE {
     EXPECT_FALSE(result_->did_swap_called);
     EXPECT_FALSE(result_->did_not_swap_called);
     result_->did_swap_called = true;
@@ skipping 71 matching lines @@
   }
 
   int commit_count_;
   int commit_complete_count_;
   TestSwapPromiseResult swap_promise_result_[3];
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostTestBreakSwapPromise);
 
 }  // namespace cc