Refactor GL bindings so there is no global GLApi or DriverGL.

ui/gl/gl_egl_api_implementation.h

Index: ui/gl/gl_egl_api_implementation.h
diff --git a/ui/gl/gl_egl_api_implementation.h b/ui/gl/gl_egl_api_implementation.h
index 9e6cabd804249468bcf54b4b408106af806c7bdc..f120aab53febebe643c07849f996d9f11dc4150f 100644
--- a/ui/gl/gl_egl_api_implementation.h
+++ b/ui/gl/gl_egl_api_implementation.h
@@ -55,6 +55,20 @@ class GL_EXPORT RealEGLApi : public EGLApiBase {
   std::map<EGLDisplay, std::string> filtered_exts_;
 };
 
+// Logs debug information for every EGL call.
+class GL_EXPORT DebugEGLApi : public EGLApi {
+ public:
+  DebugEGLApi(EGLApi* egl_api);
+  ~DebugEGLApi() override;
+
+  // Include the auto-generated part of this class. We split this because
+  // it means we can easily edit the non-auto generated parts right here in
+  // this file instead of having to edit some template or the code generator.
+  #include "gl_bindings_api_autogen_egl.h"
+
+ private:
+  EGLApi* egl_api_;
+};
 
 // Inserts a TRACE for every EGL call.
 class GL_EXPORT TraceEGLApi : public EGLApi {