Blocks exynos9820 chip from vulkan (flutter#173807)

fixes flutter#171992

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Author: gaaclarke

engine/src/flutter/shell/platform/android/android_context_dynamic_impeller.cc

@@ -17,21 +17,25 @@ namespace {
 
 static const constexpr char* kAndroidHuawei = "android-huawei";
 
-/// These are SoCs that crash when using AHB imports.
-static constexpr const char* kBLC[] = {
-    // Most Exynos Series SoC
+static constexpr const char* kBadSocs[] = {
+    // Most Exynos Series SoC. These are SoCs that crash when using AHB imports.
     "exynos7870",  //
     "exynos7880",  //
     "exynos7872",  //
     "exynos7884",  //
     "exynos7885",  //
+    "exynos7904",  //
+    // Mongoose line.
     "exynos8890",  //
     "exynos8895",  //
-    "exynos7904",  //
     "exynos9609",  //
     "exynos9610",  //
     "exynos9611",  //
-    "exynos9810"   //
+    "exynos9810",  //
+    // `exynos9820` and `exynos9825` have graphical errors:
+    // https://github.com/flutter/flutter/issues/171992.
+    "exynos9820",  //
+    "exynos9825"   //
 };
 
 static bool IsDeviceEmulator(std::string_view product_model) {
@@ -41,7 +45,7 @@ static bool IsDeviceEmulator(std::string_view product_model) {
 static bool IsKnownBadSOC(std::string_view hardware) {
   // TODO(jonahwilliams): if the list gets too long (> 16), convert
   // to a hash map first.
-  for (const auto& board : kBLC) {
+  for (const auto& board : kBadSocs) {
     if (strcmp(board, hardware.data()) == 0) {
       return true;
     }
@@ -83,7 +87,8 @@ GetActualRenderingAPIForImpeller(
 
   __system_property_get("ro.product.board", product_model);
   if (IsKnownBadSOC(product_model)) {
-    // Avoid using Vulkan on known bad SoCs.
+    FML_LOG(INFO)
+        << "Known bad Vulkan driver encountered, falling back to OpenGLES.";
     return nullptr;
   }