gpu: Add disable_blend_equation_advanced workaround for Adreno 4xx.

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index 12a958eaf603e2348a20e47af23eb45534038ce5..c86de231fd4695af0574699fbab0570a12d47675 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -973,38 +973,40 @@ void FeatureInfo::InitializeFeatures() {
     feature_flags_.chromium_sync_query = true;
   }
 
-  bool blend_equation_advanced_coherent =
-    extensions.Contains("GL_NV_blend_equation_advanced_coherent") ||
-    extensions.Contains("GL_KHR_blend_equation_advanced_coherent");
-
-  if (blend_equation_advanced_coherent ||
-      extensions.Contains("GL_NV_blend_equation_advanced") ||
-      extensions.Contains("GL_KHR_blend_equation_advanced")) {
-    const GLenum equations[] = {GL_MULTIPLY_KHR,
-                                GL_SCREEN_KHR,
-                                GL_OVERLAY_KHR,
-                                GL_DARKEN_KHR,
-                                GL_LIGHTEN_KHR,
-                                GL_COLORDODGE_KHR,
-                                GL_COLORBURN_KHR,
-                                GL_HARDLIGHT_KHR,
-                                GL_SOFTLIGHT_KHR,
-                                GL_DIFFERENCE_KHR,
-                                GL_EXCLUSION_KHR,
-                                GL_HSL_HUE_KHR,
-                                GL_HSL_SATURATION_KHR,
-                                GL_HSL_COLOR_KHR,
-                                GL_HSL_LUMINOSITY_KHR};
-
-    for (GLenum equation : equations)
-      validators_.equation.AddValue(equation);
-    if (blend_equation_advanced_coherent)
-      AddExtensionString("GL_KHR_blend_equation_advanced_coherent");
-
-    AddExtensionString("GL_KHR_blend_equation_advanced");
-    feature_flags_.blend_equation_advanced = true;
-    feature_flags_.blend_equation_advanced_coherent =
-      blend_equation_advanced_coherent;
+  if (!workarounds_.disable_blend_equation_advanced) {
+    bool blend_equation_advanced_coherent =
+        extensions.Contains("GL_NV_blend_equation_advanced_coherent") ||
+        extensions.Contains("GL_KHR_blend_equation_advanced_coherent");
+
+    if (blend_equation_advanced_coherent ||
+        extensions.Contains("GL_NV_blend_equation_advanced") ||
+        extensions.Contains("GL_KHR_blend_equation_advanced")) {
+      const GLenum equations[] = {GL_MULTIPLY_KHR,
+                                  GL_SCREEN_KHR,
+                                  GL_OVERLAY_KHR,
+                                  GL_DARKEN_KHR,
+                                  GL_LIGHTEN_KHR,
+                                  GL_COLORDODGE_KHR,
+                                  GL_COLORBURN_KHR,
+                                  GL_HARDLIGHT_KHR,
+                                  GL_SOFTLIGHT_KHR,
+                                  GL_DIFFERENCE_KHR,
+                                  GL_EXCLUSION_KHR,
+                                  GL_HSL_HUE_KHR,
+                                  GL_HSL_SATURATION_KHR,
+                                  GL_HSL_COLOR_KHR,
+                                  GL_HSL_LUMINOSITY_KHR};
+
+      for (GLenum equation : equations)
+        validators_.equation.AddValue(equation);
+      if (blend_equation_advanced_coherent)
+        AddExtensionString("GL_KHR_blend_equation_advanced_coherent");
+
+      AddExtensionString("GL_KHR_blend_equation_advanced");
+      feature_flags_.blend_equation_advanced = true;
+      feature_flags_.blend_equation_advanced_coherent =
+          blend_equation_advanced_coherent;
+    }
   }
 
   if (extensions.Contains("GL_NV_path_rendering")) {