Remove strict equality check for SkMatrix comparison (#38665)

Cherrypick:
* Remove strict equality check for SkMatrix comparison (#38665)

Author: lin-erik

.ci.yaml

@@ -8,7 +8,7 @@
 enabled_branches:
   - main
   - flutter-\d+\.\d+-candidate\.\d+
-  - fuchsia_r\d+
+  - fuchsia_r\d+[a-z]*
 
 platform_properties:
   linux:

shell/platform/fuchsia/flutter/gfx_external_view_embedder.cc

@@ -327,8 +327,29 @@ void GfxExternalViewEmbedder::SubmitFrame(
         const float view_elevation =
             kScenicZElevationBetweenLayers * scenic_layer_index +
             embedded_views_height;
-        FML_CHECK(view_mutators.total_transform ==
-                  view_params.transformMatrix());
+
+        // Verify that we're unpacking the mutators' transform matrix correctly
+        // on debug builds Use built-in get method for SkMatrix to get values
+        // See:
+        // https://source.corp.google.com/piper///depot/google3/third_party/skia/HEAD/include/core/SkMatrix.h;l=391
+#ifdef NDEBUG
+        for (int index = 0; index < 9; index++) {
+          const SkScalar mutators_transform_value =
+              view_mutators.total_transform.get(index);
+          const SkScalar params_transform_value =
+              view_params.transformMatrix().get(index);
+          if (!SkScalarNearlyEqual(mutators_transform_value,
+                                   params_transform_value, 0.0005f)) {
+            FML_LOG(FATAL)
+                << "Assertion failed: view_mutators.total_transform[" << index
+                << "] (" << mutators_transform_value
+                << ") != view_params.transformMatrix()[" << index << "] ("
+                << params_transform_value
+                << "). This likely means there is a bug with the "
+                << "logic for parsing embedded views' transform matrices.";
+          }
+        }
+#endif
 
         // Set clips for the platform view.
         if (view_mutators.clips != view_holder.mutators.clips) {