cc: Fix flaky scroll animation test

cc/trees/layer_tree_host_unittest_animation.cc

 // Copyright 2012 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 <stdint.h>
 
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/animation_host.h"
@@ skipping 877 matching lines @@
       // This happens after the impl-only animation is added in
       // WillCommitCompleteOnThread.
       Animation* animation = ScrollOffsetPlayer(*host_impl, scroll_layer_)
                                  .GetAnimation(TargetProperty::SCROLL_OFFSET);
       DCHECK(animation);
       ScrollOffsetAnimationCurve* curve =
           animation->curve()->ToScrollOffsetAnimationCurve();
 
       // Verifiy the initial and target position before the scroll offset
       // update from MT.
-      EXPECT_EQ(Animation::RunState::RUNNING, animation->run_state());

[ajuma, 2017/02/10 16:19:05]

This will be STARTING if the first draw hasn't happened yet. But it really
doesn't matter for this test, since it doesn't affect the initial and target
scroll offsets of the animation.

       EXPECT_EQ(gfx::ScrollOffset(10.f, 20.f),
                 curve->GetValue(base::TimeDelta()));
       EXPECT_EQ(gfx::ScrollOffset(650.f, 750.f), curve->target_value());
     }
   }
 
   void WillCommitCompleteOnThread(LayerTreeHostImpl* host_impl) override {
     if (host_impl->sync_tree()->source_frame_number() == 0) {
       GetImplAnimationHost(host_impl)->ImplOnlyScrollAnimationCreate(
           scroll_layer_->element_id(), gfx::ScrollOffset(650.f, 750.f),
@@ skipping 953 matching lines @@
  private:
   scoped_refptr<Layer> layer_;
   FakeContentLayerClient client_;
 };
 
 MULTI_THREAD_TEST_F(
     LayerTreeHostAnimationTestRebuildPropertyTreesOnAnimationSetNeedsCommit);
 
 }  // namespace
 }  // namespace cc