Added Chrome-side support for EXT_blend_minmax WebGL extension

gpu/command_buffer/service/feature_info_unittest.cc

Index: gpu/command_buffer/service/feature_info_unittest.cc
diff --git a/gpu/command_buffer/service/feature_info_unittest.cc b/gpu/command_buffer/service/feature_info_unittest.cc
index 973f2a0ee33b8d7679f25623ab174f4e6720ffa8..81ecfe29bf2f3cddf5a2ab98d510055f1431994d 100644
--- a/gpu/command_buffer/service/feature_info_unittest.cc
+++ b/gpu/command_buffer/service/feature_info_unittest.cc
@@ -316,6 +316,8 @@ TEST_F(FeatureInfoTest, InitializeNoExtensions) {
       GL_DEPTH_COMPONENT32_OES));
   EXPECT_FALSE(info_->validators()->texture_internal_format_storage.IsValid(
       GL_DEPTH24_STENCIL8_OES));
+  EXPECT_FALSE(info_->validators()->equation.IsValid(GL_MIN_EXT));
+  EXPECT_FALSE(info_->validators()->equation.IsValid(GL_MAX_EXT));
 }
 
 TEST_F(FeatureInfoTest, InitializeWithANGLE) {
@@ -952,6 +954,13 @@ TEST_F(FeatureInfoTest, InitializeVAOsWithClientSideArrays) {
   EXPECT_FALSE(info_->feature_flags().native_vertex_array_object);
 }
 
+TEST_F(FeatureInfoTest, InitializeEXT_blend_minmax) {
+  SetupInitExpectations("GL_EXT_blend_minmax");
+  EXPECT_THAT(info_->extensions(), HasSubstr("GL_EXT_blend_minmax"));
+  EXPECT_TRUE(info_->validators()->equation.IsValid(GL_MIN_EXT));
+  EXPECT_TRUE(info_->validators()->equation.IsValid(GL_MAX_EXT));
+}
+
 TEST_F(FeatureInfoTest, InitializeEXT_frag_depth) {
   SetupInitExpectations("GL_EXT_frag_depth");
   EXPECT_TRUE(info_->feature_flags().ext_frag_depth);