cc: Add debug info for unexpected SwapBuffersComplete

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 161 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();
 
+  int pending_swaps() const { return pending_swaps_; }
+
   // 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);
 
@@ skipping 121 matching lines @@
   bool invalidate_output_surface_funnel_;
   // prepare_tiles_funnel_ is "filled" each time PrepareTiles is called
   // and "drained" on each BeginImplFrame. If the funnel gets too full,
   // we start throttling ACTION_PREPARE_TILES such that we average one
   // PrepareTiles per BeginImplFrame.
   int prepare_tiles_funnel_;
 
   int consecutive_checkerboard_animations_;
   int max_pending_swaps_;
   int pending_swaps_;
+  int swaps_with_current_output_surface_;
   bool needs_redraw_;
   bool needs_animate_;
   bool needs_prepare_tiles_;
   bool needs_commit_;
   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_;
@@ skipping 10 matching lines @@
   bool did_request_swap_in_last_frame_;
   bool did_perform_swap_in_last_draw_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SchedulerStateMachine);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_