Revert "Refactor DisplayGbm::generateConfigs"

src/libANGLE/renderer/gl/egl/gbm/DisplayGbm.cpp

@@ -924,36 +924,24 @@ egl::Error DisplayGbm::makeCurrent(egl::Surface *drawSurface,
 
 egl::ConfigSet DisplayGbm::generateConfigs()
 {
-
-    gl::Version eglVersion(mEGL->majorVersion, mEGL->minorVersion);
-    ASSERT(eglVersion >= gl::Version(1, 4));
-
-    bool supportES3 =
-        (eglVersion >= gl::Version(1, 5) || mEGL->hasExtension("EGL_KHR_create_context")) &&
-        (mRenderer->getMaxSupportedESVersion() >= gl::Version(3, 0));
-    EGLint renderType = EGL_OPENGL_ES2_BIT | (supportES3 ? EGL_OPENGL_ES3_BIT : 0);
-
-    // clang-format off
-    std::vector<EGLint> configAttribs8888 =
-    {
-        EGL_COLOR_BUFFER_TYPE, EGL_RGB_BUFFER,
-        // CrOS doesn't support window and pixmaps?
-        EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
-        EGL_CONFIG_CAVEAT, EGL_NONE,
-        EGL_CONFORMANT, renderType,
-        EGL_RENDERABLE_TYPE, renderType,
-        EGL_RED_SIZE, 8,
-        EGL_GREEN_SIZE, 8,
-        EGL_BLUE_SIZE, 8,
-        EGL_ALPHA_SIZE, 8,
-        EGL_BUFFER_SIZE, 32,
-        EGL_DEPTH_SIZE, 24,
-        EGL_NONE
-    };
-    // clang-format on
-
-    mConfigAttribList = configAttribs8888;
-    return DisplayEGL::generateConfigs();
+    egl::ConfigSet configs;
+
+    egl::Config config;
+    config.bufferSize         = 32;
+    config.redSize            = 8;
+    config.greenSize          = 8;
+    config.blueSize           = 8;
+    config.alphaSize          = 8;
+    config.depthSize          = 24;
+    config.stencilSize        = 8;
+    config.bindToTextureRGBA  = EGL_TRUE;
+    config.renderableType     = EGL_OPENGL_ES2_BIT;
+    config.surfaceType        = EGL_WINDOW_BIT | EGL_PBUFFER_BIT;
+    config.renderTargetFormat = GL_RGBA8;
+    config.depthStencilFormat = GL_DEPTH24_STENCIL8;
+
+    configs.add(config);
+    return configs;
 }
 
 bool DisplayGbm::isValidNativeWindow(EGLNativeWindowType window) const