cc: Move SyncedScrollOffset to scroll tree

cc/base/synced_property.h

 // Copyright 2014 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.
 
 #ifndef CC_BASE_SYNCED_PROPERTY_H_
 #define CC_BASE_SYNCED_PROPERTY_H_
 
 #include "base/memory/ref_counted.h"
 
 namespace cc {
@@ skipping 95 matching lines @@
   // The new delta we would use if we decide to activate now.  This delta
   // excludes the amount that we expect the main thread to reflect back at the
   // impl thread during the commit.
   T PendingDelta() const {
     if (clobber_active_value_)
       return T::Identity();
     return active_delta_.InverseCombine(sent_delta_);
   }
 
   void set_clobber_active_value() { clobber_active_value_ = true; }
+  bool clobber_active_value() const { return clobber_active_value_; }
 
  private:
   // Value last committed to the pending tree.
   T pending_base_;
   // Value last committed to the active tree (on the last activation).
   T active_base_;
   // The difference between the active_base_ and the user-perceived value.
   T active_delta_;
   // The value sent to the main thread (on the last BeginFrame); this is always
   // identity outside of the BeginFrame-to-activation interval.
@@ skipping 52 matching lines @@
     return ScaleGroup(value_ / p.value_);
   }
 
  private:
   float value_;
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_SYNCED_PROPERTY_H_