Add TRACE calls for all gpu driver calls

ui/gl/gl_osmesa_api_implementation.h

Index: ui/gl/gl_osmesa_api_implementation.h
diff --git a/ui/gl/gl_osmesa_api_implementation.h b/ui/gl/gl_osmesa_api_implementation.h
index 6d7681c8fbe9c09e4941d501989f267bf743980e..9d00b126680b1d08f9818e8c9d4f0f38aac782ea 100644
--- a/ui/gl/gl_osmesa_api_implementation.h
+++ b/ui/gl/gl_osmesa_api_implementation.h
@@ -40,6 +40,21 @@ class GL_EXPORT RealOSMESAApi : public OSMESAApiBase {
   void Initialize(DriverOSMESA* driver);
 };
 
+// Inserts a TRACE for every OSMESA call.
+class GL_EXPORT TraceOSMESAApi : public OSMESAApi {
+ public:
+  TraceOSMESAApi(OSMESAApi* osmesa_api) : osmesa_api_(osmesa_api) { }
+  virtual ~TraceOSMESAApi();
+
+  // 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_osmesa.h"
+
+ private:
+  OSMESAApi* osmesa_api_;
+};
+
 }  // namespace gfx
 
 #endif  // UI_GL_OSMESA_API_IMPLEMENTATION_H_