[SPv2] Renaming and refactor about raster invalidation tracking

third_party/WebKit/Source/platform/graphics/paint/RasterInvalidationTracking.h

 // Copyright 2016 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 RasterInvalidationTracking_h
 #define RasterInvalidationTracking_h
 
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/Region.h"
 #include "platform/graphics/PaintInvalidationReason.h"
 #include "platform/graphics/paint/PaintRecord.h"
 #include "platform/json/JSONValues.h"
 #include "platform/wtf/Allocator.h"
 #include "platform/wtf/text/WTFString.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 namespace blink {
 
 class DisplayItemClient;
 
 struct RasterInvalidationInfo {
   DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
   // This is for comparison only. Don't dereference because the client may have
   // died.
-  const DisplayItemClient* client;
+  const DisplayItemClient* client = nullptr;
   String client_debug_name;
   IntRect rect;
-  PaintInvalidationReason reason;
-  RasterInvalidationInfo() : reason(kPaintInvalidationFull) {}
+  PaintInvalidationReason reason = kPaintInvalidationFull;
 };
 
 inline bool operator==(const RasterInvalidationInfo& a,
                        const RasterInvalidationInfo& b) {
   return a.rect == b.rect;
 }
 
-struct UnderPaintInvalidation {
+struct UnderRasterInvalidation {
   DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
   int x;
   int y;
   SkColor old_pixel;
   SkColor new_pixel;
 };
 
 struct PLATFORM_EXPORT RasterInvalidationTracking {
   DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
-  Vector<RasterInvalidationInfo> tracked_raster_invalidations;
+  Vector<RasterInvalidationInfo> invalidations;
+
+  // The following fields are for under-raster-invalidation detection.
   sk_sp<PaintRecord> last_painted_record;
   IntRect last_interest_rect;
-  Region raster_invalidation_region_since_last_paint;
-  Vector<UnderPaintInvalidation> under_paint_invalidations;
+  Region invalidation_region_since_last_paint;
+  Vector<UnderRasterInvalidation> under_invalidations;
 
   void AsJSON(JSONObject*);
 };
 
 template <class TargetClass>
 class PLATFORM_EXPORT RasterInvalidationTrackingMap {
  public:
   void AsJSON(TargetClass* key, JSONObject* json) {
-    auto it = invalidation_tracking_map_.find(key);
-    if (it != invalidation_tracking_map_.end())
+    auto it = map_.find(key);
+    if (it != map_.end())
       it->value.AsJSON(json);
   }
 
   void Remove(TargetClass* key) {
-    auto it = invalidation_tracking_map_.find(key);
-    if (it != invalidation_tracking_map_.end())
-      invalidation_tracking_map_.erase(it);
+    auto it = map_.find(key);
+    if (it != map_.end())
+      map_.erase(it);
   }
 
   RasterInvalidationTracking& Add(TargetClass* key) {
-    return invalidation_tracking_map_.insert(key, RasterInvalidationTracking())
-        .stored_value->value;
+    return map_.insert(key, RasterInvalidationTracking()).stored_value->value;
   }
 
   RasterInvalidationTracking* Find(TargetClass* key) {
-    auto it = invalidation_tracking_map_.find(key);
-    if (it == invalidation_tracking_map_.end())
+    auto it = map_.find(key);
+    if (it == map_.end())
       return nullptr;
     return &it->value;
   }
 
  private:
   typedef HashMap<TargetClass*, RasterInvalidationTracking>
       InvalidationTrackingMap;
-  InvalidationTrackingMap invalidation_tracking_map_;
+  InvalidationTrackingMap map_;
 };
 
 }  // namespace blink
 
 #endif  // RasterInvalidationTracking_h