Create GN arg to enable non-conformant features

BUILD.gn

@@ -43,6 +43,9 @@ declare_args() {
 
   # Adds run-time checks to filter out EVENT() messages when the debug annotator is disabled.
   angle_enable_annotator_run_time_checks = false
+
+  # Enables non-conformant extensions and features
+  angle_expose_non_conformant_extensions_and_versions = false
 }
 
 if (angle_build_all) {
@@ -360,6 +363,10 @@ angle_static_library("angle_common") {
       libs = [ "android" ]
     }
   }
+
+  if (angle_expose_non_conformant_extensions_and_versions) {
+    defines = [ "ANGLE_EXPOSE_NON_CONFORMANT_EXTENSIONS_AND_VERSIONS" ]
+  }
 }
 
 config("angle_image_util_config") {

doc/DevSetupAndroid.md

@@ -192,6 +192,15 @@ is_debug = false
 dcheck_always_on = true
 ```
 
+#### Application Compatibility
+
+Application compatibility may be increased by enabling non-conformant features and extensions with
+a GN arg:
+
+```
+angle_expose_non_conformant_extensions_and_versions = true
+```
+
 ## Command line for launching chrome on Android
 [This Makefile](https://github.com/phuang/test/blob/master/chromium/Makefile) contains many useful command lines for launching chrome.
 

src/libANGLE/renderer/vulkan/RendererVk.cpp

@@ -40,6 +40,13 @@
 namespace
 {
 constexpr VkFormatFeatureFlags kInvalidFormatFeatureFlags = static_cast<VkFormatFeatureFlags>(-1);
+
+#if defined(ANGLE_EXPOSE_NON_CONFORMANT_EXTENSIONS_AND_VERSIONS)
+constexpr bool kExposeNonConformantExtensionsAndVersions = true;
+#else
+constexpr bool kExposeNonConformantExtensionsAndVersions = false;
+#endif
+
 }  // anonymous namespace
 
 namespace rx
@@ -2151,6 +2158,10 @@ void RendererVk::initFeatures(DisplayVk *displayVk,
     // Negative viewports are exposed in the Maintenance1 extension and in core Vulkan 1.1+.
     ANGLE_FEATURE_CONDITION(&mFeatures, supportsNegativeViewport, supportsNegativeViewport);
 
+    // Whether non-conformant configurations and extensions should be exposed.
+    ANGLE_FEATURE_CONDITION(&mFeatures, exposeNonConformantExtensionsAndVersions,
+                            kExposeNonConformantExtensionsAndVersions);
+
     angle::PlatformMethods *platform = ANGLEPlatformCurrent();
     platform->overrideFeaturesVk(platform, &mFeatures);