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

ui/gl/gl_glx_api_implementation.h

Index: ui/gl/gl_glx_api_implementation.h
diff --git a/ui/gl/gl_glx_api_implementation.h b/ui/gl/gl_glx_api_implementation.h
index 9796d9cfae40ef8967951f2934e1f5f9a99d11b5..2c1815757cae260e35a9ed7ce29f2f269d6bab64 100644
--- a/ui/gl/gl_glx_api_implementation.h
+++ b/ui/gl/gl_glx_api_implementation.h
@@ -53,6 +53,21 @@ class GL_EXPORT RealGLXApi : public GLXApiBase {
   std::string filtered_exts_;
 };
 
+// Logs debug information for every GLX call.
+class GL_EXPORT DebugGLXApi : public GLXApi {
+ public:
+  DebugGLXApi(GLXApi* glx_api);
+  ~DebugGLXApi() 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_glx.h"
+
+ private:
+  GLXApi* glx_api_;
+};
+
 // Inserts a TRACE for every GLX call.
 class GL_EXPORT TraceGLXApi : public GLXApi {
  public: