gpu: Map glDiscardFramebufferEXT to glInvalidateFramebuffer

Map glDiscardFramebufferEXT to glInvalidateFramebuffer on OpenGL ES
3.0. Both entry points have the same functionality; just the name was
changed between EXT_framebuffer_discard and ES 3.0.

BUG=274334

Review URL: https://chromiumcodereview.appspot.com/23855003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221440 0039d316-1c4b-4281-b951-d872f2087c98

gpu/command_buffer/service/feature_info.cc

@@ -684,6 +684,11 @@ void FeatureInfo::InitializeFeatures() {
     // TODO(dsinclair): Add AddExtensionString("GL_CHROMIUM_sampler_objects")
     // when available.
   }
+
+  if (is_es3) {
+    // DiscardFramebufferEXT is automatically bound to InvalidateFramebuffer.
+    AddExtensionString("GL_EXT_discard_framebuffer");
+  }
 }
 
 void FeatureInfo::AddExtensionString(const std::string& str) {

ui/gl/generate_bindings.py

@@ -747,7 +747,7 @@ GL_FUNCTIONS = [
                        'APPLE_vertex_array_object',
                        'ARB_vertex_array_object'] },
 { 'return_type': 'void',
-  'names': ['glDiscardFramebufferEXT'],
+  'names': ['glDiscardFramebufferEXT', 'glInvalidateFramebuffer'],
   'arguments': 'GLenum target, GLsizei numAttachments, '
       'const GLenum* attachments' },
 ]