cc: Be less aggressive about scheduling for scroll handlers

cc/scheduler/scheduler_state_machine.h

 // 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.
 
 #ifndef CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_
 #define CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 159 matching lines @@
   // swap when there is not damage, for example.
   void DidSwapBuffers();
 
   // Indicates whether a redraw is required because we are currently rendering
   // with a low resolution or checkerboarded tile.
   void SetSwapUsedIncompleteTile(bool used_incomplete_tile);
 
   // Notification from the OutputSurface that a swap has been consumed.
   void DidSwapBuffersComplete();
 
-  // Indicates whether to prioritize animation smoothness over new content
-  // activation.
-  void SetSmoothnessTakesPriority(bool smoothness_takes_priority);
-  bool smoothness_takes_priority() const { return smoothness_takes_priority_; }
+  // Indicates whether to prioritize impl thread latency (i.e., animation
+  // smoothness) over new content activation.
+  void SetImplLatencyTakesPriority(bool impl_latency_takes_priority);
+  bool impl_latency_takes_priority() const {
+    return impl_latency_takes_priority_;
+  }
 
   // Indicates whether ACTION_DRAW_AND_SWAP_IF_POSSIBLE drew to the screen.
   void DidDrawIfPossibleCompleted(DrawResult result);
 
   // Indicates that a new commit flow needs to be performed, either to pull
   // updates from the main thread to the impl, or to push deltas from the impl
   // thread to main.
   void SetNeedsCommit();
 
   // Call this only in response to receiving an ACTION_SEND_BEGIN_MAIN_FRAME
@@ skipping 106 matching lines @@
   bool swap_used_incomplete_tile_;
   bool needs_commit_;
   bool inside_poll_for_anticipated_draw_triggers_;
   bool visible_;
   bool can_start_;
   bool can_draw_;
   bool has_pending_tree_;
   bool pending_tree_is_ready_for_activation_;
   bool active_tree_needs_first_draw_;
   bool did_create_and_initialize_first_output_surface_;
-  bool smoothness_takes_priority_;
+  bool impl_latency_takes_priority_;
   bool skip_next_begin_main_frame_to_reduce_latency_;
   bool skip_begin_main_frame_to_reduce_latency_;
   bool continuous_painting_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SchedulerStateMachine);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_