Add builders for tracing event's structural arguments

cc/resources/tile_priority.h

 // 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.
 
 #ifndef CC_RESOURCES_TILE_PRIORITY_H_
 #define CC_RESOURCES_TILE_PRIORITY_H_
 
 #include <algorithm>
 #include <limits>
+#include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/resources/picture_pile.h"
 #include "ui/gfx/quad_f.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace base {
 class Value;
 }
 
 namespace cc {
 
 enum WhichTree {
   // Note: these must be 0 and 1 because we index with them in various places,
   // e.g. in Tile::priority_.
   ACTIVE_TREE = 0,
   PENDING_TREE = 1,
   NUM_TREES = 2
   // Be sure to update WhichTreeAsValue when adding new fields.
 };
-scoped_ptr<base::Value> WhichTreeAsValue(
-    WhichTree tree);
+scoped_ptr<base::Value> WhichTreeAsValue(WhichTree tree);
 
 enum TileResolution {
   LOW_RESOLUTION = 0 ,
   HIGH_RESOLUTION = 1,
   NON_IDEAL_RESOLUTION = 2,
 };
-scoped_ptr<base::Value> TileResolutionAsValue(
-    TileResolution resolution);
+std::string TileResolutionToString(TileResolution resolution);
 
 struct CC_EXPORT TilePriority {
   enum PriorityBin { NOW, SOON, EVENTUALLY };
 
   TilePriority()
       : resolution(NON_IDEAL_RESOLUTION),
         required_for_activation(false),
         priority_bin(EVENTUALLY),
         distance_to_visible(std::numeric_limits<float>::infinity()) {}
 
@@ skipping 24 matching lines @@
     } else if (active.priority_bin > pending.priority_bin) {
       priority_bin = pending.priority_bin;
       distance_to_visible = pending.distance_to_visible;
     } else {
       priority_bin = active.priority_bin;
       distance_to_visible =
           std::min(active.distance_to_visible, pending.distance_to_visible);
     }
   }
 
-  scoped_ptr<base::Value> AsValue() const;
+  void AsValueInto(base::debug::TracedValue* dict) const;
 
   bool operator ==(const TilePriority& other) const {
     return resolution == other.resolution &&
            priority_bin == other.priority_bin &&
            distance_to_visible == other.distance_to_visible &&
            required_for_activation == other.required_for_activation;
   }
 
   bool operator !=(const TilePriority& other) const {
     return !(*this == other);
   }
 
   bool IsHigherPriorityThan(const TilePriority& other) const {
     return priority_bin < other.priority_bin ||
            (priority_bin == other.priority_bin &&
             distance_to_visible < other.distance_to_visible);
   }
 
   TileResolution resolution;
   bool required_for_activation;
   PriorityBin priority_bin;
   float distance_to_visible;
 };
 
-scoped_ptr<base::Value> TilePriorityBinAsValue(TilePriority::PriorityBin bin);
+std::string TilePriorityBinToString(TilePriority::PriorityBin bin);
 
 enum TileMemoryLimitPolicy {
   // Nothing.
   ALLOW_NOTHING = 0,
 
   // You might be made visible, but you're not being interacted with.
   ALLOW_ABSOLUTE_MINIMUM = 1,  // Tall.
 
   // You're being interacted with, but we're low on memory.
   ALLOW_PREPAINT_ONLY = 2,  // Grande.
 
   // You're the only thing in town. Go crazy.
   ALLOW_ANYTHING = 3,  // Venti.
 
   NUM_TILE_MEMORY_LIMIT_POLICIES = 4,
 
   // NOTE: Be sure to update TreePriorityAsValue and kBinPolicyMap when adding
   // or reordering fields.
 };
-scoped_ptr<base::Value> TileMemoryLimitPolicyAsValue(
-    TileMemoryLimitPolicy policy);
+std::string TileMemoryLimitPolicyToString(TileMemoryLimitPolicy policy);
 
 enum TreePriority {
   SAME_PRIORITY_FOR_BOTH_TREES,
   SMOOTHNESS_TAKES_PRIORITY,
   NEW_CONTENT_TAKES_PRIORITY,
   NUM_TREE_PRIORITIES
   // Be sure to update TreePriorityAsValue when adding new fields.
 };
-scoped_ptr<base::Value> TreePriorityAsValue(TreePriority prio);
+std::string TreePriorityToString(TreePriority prio);
 
 class GlobalStateThatImpactsTilePriority {
  public:
   GlobalStateThatImpactsTilePriority()
       : memory_limit_policy(ALLOW_NOTHING),
         soft_memory_limit_in_bytes(0),
         hard_memory_limit_in_bytes(0),
         num_resources_limit(0),
         tree_priority(SAME_PRIORITY_FOR_BOTH_TREES) {}
 
   TileMemoryLimitPolicy memory_limit_policy;
 
   size_t soft_memory_limit_in_bytes;
   size_t hard_memory_limit_in_bytes;
   size_t num_resources_limit;
 
   TreePriority tree_priority;
 
   bool operator==(const GlobalStateThatImpactsTilePriority& other) const {
     return memory_limit_policy == other.memory_limit_policy &&
            soft_memory_limit_in_bytes == other.soft_memory_limit_in_bytes &&
            hard_memory_limit_in_bytes == other.hard_memory_limit_in_bytes &&
            num_resources_limit == other.num_resources_limit &&
            tree_priority == other.tree_priority;
   }
   bool operator!=(const GlobalStateThatImpactsTilePriority& other) const {
     return !(*this == other);
   }
 
-  scoped_ptr<base::Value> AsValue() const;
+  void AsValueInto(base::debug::TracedValue* dict) const;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_PRIORITY_H_