Use NV_draw_buffers to implement EXT_draw_buffers

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 106e183abb1a896a5b6aed68084659cca794464c..c9b224a1bb7abcd89abef85dc220987eaaa30ea2 100644
--- a/gpu/command_buffer/service/feature_info_unittest.cc
+++ b/gpu/command_buffer/service/feature_info_unittest.cc
@@ -123,6 +123,8 @@ TEST_F(FeatureInfoTest, Basic) {
   EXPECT_FALSE(info_->feature_flags().native_vertex_array_object);
   EXPECT_FALSE(info_->feature_flags().map_buffer_range);
   EXPECT_FALSE(info_->feature_flags().use_async_readpixels);
+  EXPECT_FALSE(info_->feature_flags().ext_draw_buffers);
+  EXPECT_FALSE(info_->feature_flags().nv_draw_buffers);
   EXPECT_FALSE(info_->feature_flags().ext_discard_framebuffer);
   EXPECT_FALSE(info_->feature_flags().angle_depth_texture);
   EXPECT_FALSE(info_->feature_flags().is_angle);
@@ -1254,6 +1256,19 @@ TEST_F(FeatureInfoTest, InitializeWithNVFence) {
   EXPECT_TRUE(gfx::GLFence::IsSupported());
 }
 
+TEST_F(FeatureInfoTest, InitializeWithNVDrawBuffers) {
+  SetupInitExpectationsWithGLVersion("GL_NV_draw_buffers", "", "OpenGL ES 3.0");
+  EXPECT_TRUE(info_->feature_flags().nv_draw_buffers);
+  EXPECT_TRUE(info_->feature_flags().ext_draw_buffers);
+}
+
+TEST_F(FeatureInfoTest, InitializeWithPreferredEXTDrawBuffers) {
+  SetupInitExpectationsWithGLVersion(
+      "GL_NV_draw_buffers GL_EXT_draw_buffers", "", "OpenGL ES 3.0");
+  EXPECT_FALSE(info_->feature_flags().nv_draw_buffers);
+  EXPECT_TRUE(info_->feature_flags().ext_draw_buffers);
+}
+
 TEST_F(FeatureInfoTest, ARBSyncDisabled) {
   CommandLine command_line(0, NULL);
   command_line.AppendSwitchASCII(