Add Gpu Tracing to Ganesh

src/gpu/gl/GrGLInterface.cpp

Index: src/gpu/gl/GrGLInterface.cpp
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index c0ff716d190c6e825f31e60111442eafedcfe0ca..f40821f3dafc31225936df1fed3a797de252a6b3 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -479,7 +479,6 @@ bool GrGLInterface::validate() const {
         }
     }
 
-#if 0
     if (fExtensions.has("GL_EXT_debug_marker")) {
         if (NULL == fFunctions.fInsertEventMarker ||
             NULL == fFunctions.fPushGroupMarker ||
@@ -487,6 +486,5 @@ bool GrGLInterface::validate() const {
             RETURN_FALSE_INTERFACE
         }
     }
-#endif
     return true;
 }