Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/mantaflow/patches/liquid-mesh-performance.patch

@@ -0,0 +1,43 @@
+diff --git a/extern/mantaflow/preprocessed/plugin/flip.cpp b/extern/mantaflow/preprocessed/plugin/flip.cpp
+index 8757958d4b0..f5d7147c34f 100644
+--- a/extern/mantaflow/preprocessed/plugin/flip.cpp
++++ b/extern/mantaflow/preprocessed/plugin/flip.cpp
+@@ -1012,6 +1012,7 @@ struct ComputeAveragedLevelsetWeight : public KernelBase {
+                  const ParticleIndexSystem &indexSys,
+                  LevelsetGrid &phi,
+                  const Real radius,
++                 const Real sradiusInv,
+                  const ParticleDataImpl<int> *ptype,
+                  const int exclude,
+                  Grid<Vec3> *save_pAcc = nullptr,
+@@ -1020,8 +1021,6 @@ struct ComputeAveragedLevelsetWeight : public KernelBase {
+     const Vec3 gridPos = Vec3(i, j, k) + Vec3(0.5);  // shifted by half cell
+     Real phiv = radius * 1.0;                        // outside
+ 
+-    // loop over neighborhood, similar to ComputeUnionLevelsetPindex
+-    const Real sradiusInv = 1. / (4. * radius * radius);
+     const int r = int(radius) + 1;
+     // accumulators
+     Real wacc = 0.;
+@@ -1120,17 +1119,19 @@ struct ComputeAveragedLevelsetWeight : public KernelBase {
+   {
+     const int _maxX = maxX;
+     const int _maxY = maxY;
++    // loop over neighborhood, similar to ComputeUnionLevelsetPindex
++    const Real sradiusInv = 1. / (4. * radius * radius);
+     if (maxZ > 1) {
+       for (int k = __r.begin(); k != (int)__r.end(); k++)
+         for (int j = 0; j < _maxY; j++)
+           for (int i = 0; i < _maxX; i++)
+-            op(i, j, k, parts, index, indexSys, phi, radius, ptype, exclude, save_pAcc, save_rAcc);
++            op(i, j, k, parts, index, indexSys, phi, radius, sradiusInv, ptype, exclude, save_pAcc, save_rAcc);
+     }
+     else {
+       const int k = 0;
+       for (int j = __r.begin(); j != (int)__r.end(); j++)
+         for (int i = 0; i < _maxX; i++)
+-          op(i, j, k, parts, index, indexSys, phi, radius, ptype, exclude, save_pAcc, save_rAcc);
++          op(i, j, k, parts, index, indexSys, phi, radius, sradiusInv, ptype, exclude, save_pAcc, save_rAcc);
+     }
+   }
+   void run()