WebGL: GL_RGB emulation for IOSurface backed textures. [For reference only]

ui/gl/gl_image.h

Index: ui/gl/gl_image.h
diff --git a/ui/gl/gl_image.h b/ui/gl/gl_image.h
index 6b98fe995b8127d26fd47191959c56a6a09ec59f..69553855d2aa3a533fc297810013343eeb9807da 100644
--- a/ui/gl/gl_image.h
+++ b/ui/gl/gl_image.h
@@ -74,6 +74,10 @@ class GL_EXPORT GLImage : public base::RefCounted<GLImage> {
                             uint64_t process_tracing_id,
                             const std::string& dump_name) = 0;
 
+  // Whether the image is emulating an (GL_RGB or GL_BGR) internal format with
+  // (GL_RGBA or GL_BGRA).
+  virtual bool EmulatingRGB() const = 0;
+
  protected:
   virtual ~GLImage() {}