Remove mInvalidatedCachedSetAges from Flattener.

This member is effectively unused. It's being maintained and updated
throughout the code, but it's never being read.

Flag: EXEMPT cleanup
Bug: None
Test: atest FlattenerTest
Change-Id: Idf1a6faf5933a81116178ee88b8604d606ab80f5

Author: ericsum26

services/surfaceflinger/CompositionEngine/include/compositionengine/impl/planner/Flattener.h

@@ -253,7 +253,6 @@ class Flattener {
     std::unordered_map<size_t, size_t> mFinalLayerCounts;
     size_t mCachedSetCreationCount = 0;
     size_t mCachedSetCreationCost = 0;
-    std::unordered_map<size_t, size_t> mInvalidatedCachedSetAges;
 };
 
 } // namespace compositionengine::impl::planner

services/surfaceflinger/CompositionEngine/src/planner/Flattener.cpp

@@ -243,17 +243,9 @@ void Flattener::resetActivities(NonBufferHash hash, time_point now) {
 
     mCurrentGeometry = hash;
     mLastGeometryUpdate = now;
-
-    for (const CachedSet& cachedSet : mLayers) {
-        if (cachedSet.getLayerCount() > 1) {
-            ++mInvalidatedCachedSetAges[cachedSet.getAge()];
-        }
-    }
-
     mLayers.clear();
 
     if (mNewCachedSet) {
-        ++mInvalidatedCachedSetAges[mNewCachedSet->getAge()];
         mNewCachedSet = std::nullopt;
     }
 }
@@ -312,7 +304,6 @@ bool Flattener::mergeWithCachedSets(const std::vector<const LayerState*>& layers
             mNewCachedSet->getFirstLayer().getState()->getId() == (*incomingLayerIter)->getId()) {
             if (mNewCachedSet->hasBufferUpdate()) {
                 ALOGV("[%s] Dropping new cached set", __func__);
-                ++mInvalidatedCachedSetAges[0];
                 mNewCachedSet = std::nullopt;
             } else if (mNewCachedSet->hasReadyBuffer()) {
                 ALOGV("[%s] Found ready buffer", __func__);
@@ -338,10 +329,6 @@ bool Flattener::mergeWithCachedSets(const std::vector<const LayerState*>& layers
                         };
                         ++incomingLayerIter;
                     }
-
-                    if (currentLayerIter->getLayerCount() > 1) {
-                        ++mInvalidatedCachedSetAges[currentLayerIter->getAge()];
-                    }
                     ++currentLayerIter;
 
                     skipCount -= layerCount;
@@ -380,7 +367,6 @@ bool Flattener::mergeWithCachedSets(const std::vector<const LayerState*>& layers
             }
         } else if (currentLayerIter->getLayerCount() > 1) {
             // Break the current layer into its constituent layers
-            ++mInvalidatedCachedSetAges[currentLayerIter->getAge()];
             for (CachedSet& layer : currentLayerIter->decompose()) {
                 bool disableBlur =
                         priorBlurLayer && priorBlurLayer == (*incomingLayerIter)->getOutputLayer();