Make scroll offset type of float in cc

cc/animation/layer_animation_controller.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/animation/layer_animation_controller.h"
 
 #include <algorithm>
 
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_delegate.h"
@@ skipping 516 matching lines @@
     // necessarily mean that it needs to be copied over and started; it may
     // have already finished. In this case, the impl thread animation will
     // have already notified that it has started and the main thread animation
     // will no longer need
     // a synchronized start time.
     if (!animations_[i]->needs_synchronized_start_time())
       continue;
 
     // Scroll animations always start at the current scroll offset.
     if (animations_[i]->target_property() == Animation::ScrollOffset) {
-      gfx::Vector2dF current_scroll_offset;
+      gfx::ScrollOffset current_scroll_offset;
       if (controller_impl->value_provider_) {
         current_scroll_offset =
             controller_impl->value_provider_->ScrollOffsetForAnimation();
       } else {
         // The owning layer isn't yet in the active tree, so the main thread
         // scroll offset will be up-to-date.
         current_scroll_offset = value_provider_->ScrollOffsetForAnimation();
       }
       animations_[i]->curve()->ToScrollOffsetAnimationCurve()->SetInitialValue(
-          current_scroll_offset);
+          current_scroll_offset.ToVector2dF());

[danakj, 2014/09/25 22:01:26]

ScrollOffsetAnimationCurve should be ScrollOffsets?
https://code.google.com/p/chromium/codesearch#chromium/src/cc/animation/scrol...

[Yufeng Shen (Slow to review), 2014/09/26 20:19:07]

Done.

     }
 
     // The new animation should be set to run as soon as possible.
     Animation::RunState initial_run_state =
         Animation::WaitingForTargetAvailability;
     scoped_ptr<Animation> to_add(
         animations_[i]->CloneAndInitialize(initial_run_state));
     DCHECK(!to_add->needs_synchronized_start_time());
     to_add->set_affects_active_observers(false);
     controller_impl->AddAnimation(to_add.Pass());
@@ skipping 456 matching lines @@
         value_observers_);
     LayerAnimationValueObserver* obs;
     while ((obs = it.GetNext()) != NULL)
       if (obs->IsActive())
         return true;
   }
   return false;
 }
 
 }  // namespace cc